I believe Cumbrianboy's guess is spot on.
I looked at the CAA pax figures for November and December, and didn't think things are too bad with what destinations remain, considering EasyJet dumped Krakow, Belfast, Edinburgh and Jersey all year round service. Stobarts routes seemed to be growing except for Maastricht, and Antwerp is too competetive. Perhaps one ATR operating profitable routes only makes sense.
Flybe seem to be a headless chicken operation at the moment. I hope they will settle down in their operations. Nobody has explained why Newquay was transferred to STN. Fingers crossed for 2016 and hope EZY will find new extra destinations.