AFAIK two of the prototypes are still at Bear, setup as models for a future version of Viewliner cars. The third was last reported in Beech Grove.But while I'm at it, here's another. Assuming they have not been scrapped, there are two or three Viewliner prototypes at Bear DE just sitting. Let's gut them, mechanically bring them up to 2008, and turn them into "Atlantic Palour" cars. The car shells should be fine. The double row of windows would make for sort of an observation car feel. Then let's select one of the two Silver Service trains, and make it an east coast version of the Coast Starlight with upgraded food and the Palour for Sleeper passengers. They would need more than two or three, but you got to start somewhere. Right now, the Silvers seem to be a ride and not much more. Compared to Superliner trains, the single level trains are pretty rag-tag. The so-called "lounge" on the single level LD's is something a tad short of a "lounge car". Having an Atlantic Palour (they can use that name for free: my gift to Amtrak) would be a nice perk. This may be just another idea that has no chance, but daydreaming is fun, and free.
As for not having enough cars, if they ran them on the Lake Shore three would be enough. There would be no spares, so any required inspections, failures, or needed maintenance work would mean that at least one RT would have to run without the lounge.