I will add as a note - I realize that the Superliners do need replacing, but if Amtrak isn't going to go with a "single fleet" model then there's another option - the Cap, CONO, and Eagle/Sunset (in particular) could be made to "swing" between single level and bilevel on a long(er)-term basis (i.e. 5-10 year cycles) so that each order would explicitly open up capacity for either the NYP-bound single-level-locked trains or the big Western LD trains. This would, unfortunately for Amtrak's planning, recommend a single-level order first (to allow those trains' equipment to be cascaded westwards) - ideally you'd have done this with a 300-400 car order at Viewliner II time, but that's in the past - with those sleepers (plus anything they can shake out of Beech Grove) being used to add capacity in the west, then with a Superliner replacement order coming on the heels of that (which would allow full replacement of the Superliners as well as reverting some trains back to bilevel).
I still think that going all-single-level is the correct answer, but this would probably be the second-best option. Naturally, of course, Amtrak has managed to go with a really bad option instead.
As to the bids...I'm wondering how this goes if they either get no bids or just one bid.