Florida's situation is a headache and then some. Mind you, an ideal situation would see most trains focused on Orlampa plus the East Coast (with coverage down to Naples or on the old Silver Palm line in northern Florida optional), but the lack of a decent Orlando-FEC link makes that pretty hard. For all that Florida's population has clustered nicely in a lot of cases, it's clustered in too many corridors for a number of city pairs to work well. To top this off, the I-4 corridor veers off of the A-line, complicating a /lot/ of efforts on that front (witness the long-term Sunrail plans, which simply cannot connect directly to the Daytona area, instead terminating in Deland).
As to the point about the runs in/to Florida: As noted above, Florida-NEC service has a lot going for it that didn't exist back in the 1970s. Assuming a population of about 7 million at A-Day, Florida will have roughly tripled in size since then with the passage of a few more years. Moreover, when you look back at 1970/71, Orlando wasn't yet the destination it is now. While Disney World was present, it was smaller than it is now; likewise, Universal was still nearly 20 years off; Busch Gardens was much less of a major park at the time, SeaWorld didn't exist...central Florida then simply wasn't what it is now. Of course, there was more focus on the coast...but even those resorts have grown as time has gone by.
One thing that I don't think has been considered is that if Amtrak wanted to, overnight trains with morning arrivals in Miami and Orlando/Kissimmee/Tampa could be pitched as "getting you to Florida before the parks open". Right now, I can not get into Kissimmee before about 11 AM, which means that there's no way I can get to Disney before about noon if I'm being honest about picking up a rental car and/or dropping my bags off at a hotel. Likewise, I can't hope to hit Tampa before 12:30, which means I'm not going to be on the beach before mid-afternoon. Moving those times up by about 3-4 hours for the Orlando branch of things would be /really/ nice. Likewise, being able to go from somewhere to Miami and get there before dinner time would be a good selling point (an 8 AM arrival into Miami would probably sell some tickets). In that same vein, evening departures from these places could be pitched as giving you the "whole last day" in Florida.
Of course, another point to consider is that while NEC-Florida service is a big thing, Virginia and North Carolina are two other markets to seriously look at. NYP-MIA is always going to be a rather long run, but something that could somehow focus on serving the area between Washington and Charlotte (such as the idea of rerouting the Star to serve CLT)? Again, you start gaining business from those other intermediate markets...and I'm not even considering Atlanta here for reasons discussed elsewhere involving a certain airline.
But anyhow...looking at Florida proper, the biggest hangup I can see going forward is how to link Tampa, Orlando, and associated areas with the FEC. Orlando proper is a /big/ problem (witness how the HSR plan completely skipped it), but the whole region is disengaged from the coast as far as rail goes. Also, the geography presents a problem in the vein of an essay I saw on linking the San Francisco Airport to the rail system...no matter what, unless you were running a lot of trains and willing to set up some interesting switching options, you had to run some sort of transfer to the airport line (either by running trains through to the airport and forcing a transfer to continue on southwards or by forcing the transfer to go to the airport). In most cases, a train coming up the coast from Miami can go to Orlando or Jacksonville, but not both.
Ideally, looking at the 2006 plan, some sort of rail line along FL528 would allow you to run corridor trains from Tampa to Cocoa. A question: Is there some way that a corridor train could be sent into the Orlando station with a push-pull configuration, stopped there for a 5 minute hold for the engineer to get to the other end of the train, and then run back south and out to Cocoa via 528 "backwards" via the use of a cab car? Is there some other way to "cover" Orlando with a decent link into downtown that doesn't involve switching to surface buses (i.e. something that will NOT sell with business travelers)? Looking at this was something that always killed the bullet train in my mind...if you don't somehow hit Orlando proper, you might get tourist traffic but you miss out on business traffic, and that will be a component on corridor services. I'm expecting that you'll have a forced transfer at Cocoa a fair portion of the time (though if Florida got its act together...they're already buying one chunk of the A-line as it is, and they could probably acquire more if they so desired...they could probably run much closer connections at Cocoa than they allow most of the time), but even this could be limited (if they're running 4-5 trains per day Miami-Cocoa, you could "pair" one or two that stop at Cocoa with ones that are going from Cocoa to Tampa and simply run sets through rather than forcing transfers).
As to the point about the runs in/to Florida: As noted above, Florida-NEC service has a lot going for it that didn't exist back in the 1970s. Assuming a population of about 7 million at A-Day, Florida will have roughly tripled in size since then with the passage of a few more years. Moreover, when you look back at 1970/71, Orlando wasn't yet the destination it is now. While Disney World was present, it was smaller than it is now; likewise, Universal was still nearly 20 years off; Busch Gardens was much less of a major park at the time, SeaWorld didn't exist...central Florida then simply wasn't what it is now. Of course, there was more focus on the coast...but even those resorts have grown as time has gone by.
One thing that I don't think has been considered is that if Amtrak wanted to, overnight trains with morning arrivals in Miami and Orlando/Kissimmee/Tampa could be pitched as "getting you to Florida before the parks open". Right now, I can not get into Kissimmee before about 11 AM, which means that there's no way I can get to Disney before about noon if I'm being honest about picking up a rental car and/or dropping my bags off at a hotel. Likewise, I can't hope to hit Tampa before 12:30, which means I'm not going to be on the beach before mid-afternoon. Moving those times up by about 3-4 hours for the Orlando branch of things would be /really/ nice. Likewise, being able to go from somewhere to Miami and get there before dinner time would be a good selling point (an 8 AM arrival into Miami would probably sell some tickets). In that same vein, evening departures from these places could be pitched as giving you the "whole last day" in Florida.
Of course, another point to consider is that while NEC-Florida service is a big thing, Virginia and North Carolina are two other markets to seriously look at. NYP-MIA is always going to be a rather long run, but something that could somehow focus on serving the area between Washington and Charlotte (such as the idea of rerouting the Star to serve CLT)? Again, you start gaining business from those other intermediate markets...and I'm not even considering Atlanta here for reasons discussed elsewhere involving a certain airline.
But anyhow...looking at Florida proper, the biggest hangup I can see going forward is how to link Tampa, Orlando, and associated areas with the FEC. Orlando proper is a /big/ problem (witness how the HSR plan completely skipped it), but the whole region is disengaged from the coast as far as rail goes. Also, the geography presents a problem in the vein of an essay I saw on linking the San Francisco Airport to the rail system...no matter what, unless you were running a lot of trains and willing to set up some interesting switching options, you had to run some sort of transfer to the airport line (either by running trains through to the airport and forcing a transfer to continue on southwards or by forcing the transfer to go to the airport). In most cases, a train coming up the coast from Miami can go to Orlando or Jacksonville, but not both.
Ideally, looking at the 2006 plan, some sort of rail line along FL528 would allow you to run corridor trains from Tampa to Cocoa. A question: Is there some way that a corridor train could be sent into the Orlando station with a push-pull configuration, stopped there for a 5 minute hold for the engineer to get to the other end of the train, and then run back south and out to Cocoa via 528 "backwards" via the use of a cab car? Is there some other way to "cover" Orlando with a decent link into downtown that doesn't involve switching to surface buses (i.e. something that will NOT sell with business travelers)? Looking at this was something that always killed the bullet train in my mind...if you don't somehow hit Orlando proper, you might get tourist traffic but you miss out on business traffic, and that will be a component on corridor services. I'm expecting that you'll have a forced transfer at Cocoa a fair portion of the time (though if Florida got its act together...they're already buying one chunk of the A-line as it is, and they could probably acquire more if they so desired...they could probably run much closer connections at Cocoa than they allow most of the time), but even this could be limited (if they're running 4-5 trains per day Miami-Cocoa, you could "pair" one or two that stop at Cocoa with ones that are going from Cocoa to Tampa and simply run sets through rather than forcing transfers).