The answer here, as usual, is quite a bit more complicated. Starting up a corridor is generally going to run a couple hundred million dollars, so Amtrak is going to need external support to start any. The more important question, though, is who should pay for for those costs and operating costs during "ramp up", since losses in the first few years can be larger than those later on.sJust about all Amtrak growth in the short distance markets has occurred because of state support. The state-supported routes have thrived. It's the best way to launch new services. If local government isn't interested, then their states lose out. It's not fair to the states that support their local services to give free rides to those that don't want to back up their desires with money.I think Amtrak is kind of hamstrung in the market that they can really exploit-the 200-300 mile corridor runs. Any trip that takes 5 hours or less is very attractive competition to airline travel. The fact that these now have to be funded by the states eliminates Amtrak starting, and making successful, these routes, then selling that operating cost to the states after showing value for that state on those routes. In the current fiscal climate, very few state governments are going to stick their budgets out there to subsidize an untested route. If PRIA could be tweeked to allow this, it might open up new markets for corridor rail and eventually high speed rail in some corridors. The time people spend in airport lines make these shorter routes very attractive.
Of course, it's also worth noting that there has been no serious talk of actively ditching a state-backed train that had existed for more than 2-3 years in about thirty years. The chatter in the last year or two surrounded states not picking up the tab on an existing train whose cost to them was being hiked/transferred to them. There have been a few demonstration projects that sputtered (the Gulf Breeze, for example).
By the way, the reason the rules exist restricting Amtrak's ability to add routes is because of a bunch of bad judgment on this front in the late 90s (yet another legacy of Warrington's Freight Follies).