Nope, they would have to park more CR7's to get more Ejets, which is a possibility. Having a few thousand hours of CRJ time I remember it best for its flight deck ergonomics, not so much for it's comfortable passenger cabin. The Ejet is more airbus/737 like, and they should be at mainline but that shipped sailed long ago.

Our scope also contains a "one way check valve" for the 50 seaters, not that anyone is making them anymore, so once a hull leaves the fleet they can't replace it with another one. Also, as they get more 76 seat aircraft, above 153, block hour limits off UAL narrow body block hours really start to constrict.

Long term (5-10 years), my guess is that UAL purges all CR2's, E145's, and most CR7's for an almost exclusive Ejet UAX fleet. If you're not at Mesa, RAH, Skywest, or Commutair (Q200/300 in the northeast) then you probably won't be part of the UAX portfolio. Of those 4 carriers, Skywest's UAX footprint will shrink dramatically with all the 50 seat feed they currently provide.