Meanwhile, back in the States, I foresee that Amtrak will be phasing out the LD's. The Board wants 'em gone, and the congressional support will gradually wane.
Even if "Amtrak Joe" is back in the WH - and in the Oval, I foresee no difference (nuff on that).
Looking overseas, it appears that in the UK, the model on State owned roads is Sleepers and one all purpose Food & Beverage car. In Western Continental Europe, where the OBB (Austria) has rushed in where the others have bailed out, limited F&B is provided in each car by the Attendant (Mr. Morris, I was not about to give up a four star hotel simply to ride an NJ to Rome and fly back to SZG/LOWS).
On the State owned NSW lines where there is Sleeper service from Sydney to Brisbane (arrival and vacate 3AM; Seat 61 has "words" about that) and Melbourne, there is one sleeper and one F&B car.
I think the "writing is on the wall".
So over here, I do not foresee any LD car replacement order. What I do foresee, as the Superliners become "Ocean View", is taking the 75 car V Sleep fleet and assigning them to all remaining LD trains along with an F&B that will likely become the fate of the V-Diners.
Coaches will simply be LD configured of whatever the Short Distance replacement car will be. The "mistake" made with the A-Il's that they were not readily convertible to SD cars will not be repested.
That is what I foresee for a service for which the need is ever lessening - if in fact it was ever during the Amtrak era.