It is insanely complicated now to plan a long trip that involves more than one train, and I cannot imagine anyone except the most hardcore Amtrak fan is going to make the effort.
I love the train, and I'm in the process of trying to plan a trip for next year that's Los Angeles to Chicago, Chicago to DC, and then reverse. Let me tell you, it is ridiculous how tough it is to plan because of the 3x weekly scheduling and I am using a blank calender page and print out of the train schedules to try and figure it out.
Because the Capitol Ltd and the Cardinal are BOTH only leaving DC for Chicago on Sun/Wed/Fri, I either have to spend fewer days than I want in DC or stay longer than I want. Figuring out days of the week for two-night LD trains is really confusing, because depending on where you board, you have to remember that a train that left Chicago on Fri is going to reach Denver on Sat, for example, so if you are boarding in Denver, you have to take that into account and not the schedule put out by Amtrak.
Anyway, it's a mess and I cannot see much hope of a surge of riders when it's so friggin' hard to plan a trip with multiple legs, and the $$$$$$$ for a roomette or sleeper with subpar meals is insane.