Props Rule!
A lot of the driving force here is not aircraft mission suitability but who will finance any acquistions. The Q400 and CRJ700 are both Bombardier products and they would love to keep Embraer off Comair property. Right now, Canada seems to be more willing to cough up ca$h than Brazil.
FDJ2 appears to be correct, there is no guarantee that a Q would pay identical CRJ700 rates. The assumption has always been that the reason the contract specified certified seats rather than aircraft type was that it had not been decided which jet (the CRJ700 or the ERJ170) had been selected. But a turboprop also fits into the mix and it will pay less, I can guarantee that!
There are so many cities within an hour's flight of which could justify a turboprop: SDF, LEX, CMH, CLE, CAK, PIT, DET, even ORD. It would be a nice Florida bird, too. EYW is still a Comair station.
Many people do not know that Comair was going to be the North American launch customer for the Saab 2000 so Big Ass Turboprops are not unknown here for their superior operating costs on short range flights and would give them a competitve advantage. Suddenly, most of their competitors would be falling all over themselves getting back into the turboprop business.
Now, if only they would put the Twin Otter back into production ...