CMR
Well, they almost have already.
Their only route this winter will be the JER which is down for daily except Sat.
This summer they reduced the BHD, BOD and EGC rotations from previous summers. The TLS is also to go this winter.
It seems that the easyJet competition to BFS and the new daily Orange route to TLS has had its effect.
If they don't return next summer it will be a particular shame about the BHD (maybe Air Southwest will look at it, although the easyJet at BFS would come into the equation with them too)) and the BOD, as the latter is one of Bristol's earliest twin cities and the former very convenient for the centre of Belfast.
Flybe seem well set down the M5 at EXT so it probably makes sense to concentrate their southwest efforts from there rather than try to give easyJet a run for its money at its biggest UK base outside London and, of course, Flybe never based aircraft at BRS.
babymax
Unless an Excel insider is prepared to divulge yield etc figures on here (unlikely) one can only assume that Excel is satisfied with its BRS base.
It has had one of its own B 737s and an Air Malta A 320 based at BRS since summer 05 and they continued through last winter and this summer and, as far as I am aware, will continue through this winter and presumably next summer.
Finally, I note from Mayfly that the first-ever scheduled service from BRS to the Canary Islands will commence this coming Tuesday on behalf of BAConnect using an A 320 to TFS.