I imagine current players will take the mantle between them.
Jet2 may decide its too much of an opportunity to miss taking a go at LGW for instance or maybe Bristol and get a good foothold in the South.
Virgin likely will take up the Long Haul routes and consolidate that into their current ops.
The only possible new player would be Virgin having a pop at Europe, although even then didn't stick with Virgin Sun for long so who knows.
easyJet is the interesting one as they are relaunching the holidays arm so may look to utilise that more, but then airports like BHX and EMA that dont have an easyJet presence would be left unplugged.