One thing dawned on me yesterday. Amtrak should buy only single level cars going forward. This is because there are many corridor stations that can be easily upgraded to high level platforms because the don't see freight trains (also, the venture cars have gap fillers, so it will now be possible to build high level platforms without gauntlet tracks), such as St Louis Gateway. However, these stations also serve as stops for superliner trains, so high platforms aren't possible. If Amtrak buys standard single level high floor equipment, this leaves open the possibility for raising the platform hight for many stations.
This will be a recurring point of contention here, and everywhere else for the foreseeable future.
I'll give my two cents again: Amtrak will not stray from the status quo. Single level equipment will alter the structure of trains too much. They'd have to lengthen countless platforms, change train layouts, and likely deal with longer, heavier trains. Personally, I think raising platforms for level boarding should be in the cards, but that'll be easier with lower boarding bi-levels. Plenty of stations around me (Green River, Helper) are already having their platforms raised slightly and what appear to be wheelchair ramps are being installed.
If not for age-related deterioration, the Superliners would stay in service indefinitely. Superliners are a tried and proven platform that works, Amtrak is hardly in a position to gamble the next 50 years on a new idea when what they have works just fine.
I'd bet my left leg Amtrak sticks to bilevel cars, the trade-offs are too risky.