I've brought up the Santa Fe Hi-Levels before, and I'll give you credit for something that isn't a bad idea. What basically happened with those is that IL bought them (I believe from Amtrak) but never managed to round up the money to refurbish them. Amtrak bought back 5 of the 6 lounges as PPCs, but they've never sought to use the coaches for fleet maintenance reasons. They're currently sitting in a yard outside St. Louis, IIRC.
Here's another idea:
1. Take coaches off from the AT.
2. Convert into sleepers.
3. Redistribute to any trains that need them.
Where did the High-Levels go? Can they be brought back into service to relieve shortages?
The problem with the Hi-Levels is that they're non-matching equipment that happens to be fast approaching 60 years old. Now, as North Carolina has shown, old equipment can be put to good use for a very long time, particularly if it hasn't been moving around for a large amount of that time and has been maintained...but there are drawbacks as well. It might be worth Amtrak's time and energy to try and work with IL to pitch the cars to one state or another for starting up corridor service somewhere on the cheap (Florida, I'm looking at you), but Amtrak would have to throw in some SSL/coach-cafe cars to supplement them. The one upside, though, is that the Hi-Level fleet did include some step-down coaches IIRC, so they could run them as part of a split-level train (i.e. a train with a couple of bilevels on one end and some single level cars on the other end).