Eagle will definately be smaller in the future as another regional and JB will be eating more off their plate. My guess is that 5 years from now, Eagle will have at least the 47 CRJ's, half the 145's, maybe a few 140's, NO 135's and 20 or so ATR's.
About 60-65% of current size.
The remainder will be done by CHQ and possibly a third regional with JB's relationship with AA expanded as currently threatened, although a lot of their flying will replace S-80 ops which will shrink substantially.
Eagle will still have somewhere between 1500 and 2000 pilots.