I'm pretty sure the other destinations could continue to be served with the E90 just fine. The hope is that with the runway extension F9 could try to get the E90 certified for ASE and get rid of the rest of the Q's. Personally I'd like to see them dump the CSeries in favor of a bunch of new Q's and operate a lot of short haul midwestern traffic to/from MKE but I don't think that day will come.