I wouldn't say that Q400 is the problem here. There are already many destinations served by Q400:
HBE, ADB, CTA, BRI, DBV, TGD, SPU
in addition to CLJ, ZAD, ZAG, PMO -which will run a few times per week.
At the same time, some destinations which were a mix of DH4/319/320 appear to be "upgraded" to only airbus: BEG, NAP, SOF, TIA, so that will "free" some rotations.
The issue I see is that there appear to many 319 (currently only one). I see at least 3 overlaps for S18, which means that flight planning assumes two more are coming... Of course, these schedules (and especially the a/c types) are preliminary and we will see more changes soon.