I must say it does seem somewhat erratic of Flybe to cancel the whole winter season's Hamburg flights a week before they were due to begin, not exactly confidence inspiring for passengers.
It is hard to see who will fill the gap left by the sun routes, if Jet2 were to migrate south then they could find a home for the two 733's formerly based in Blackpool but I don't see many other options. Without the E195's there should be room to park 2 738/A320 sized aircraft overnight so that make help matters a little.