First and foremost whatever happens with the X-men+MCU the biggest reason will probably be=Wolverine. With Jackman out there is ofc the problem of recasting, witch also kills much of the demand and potential profit. The best outcome would be a rather quick solution that puts the avengers, spider-man and wolverine(Jackman) in the same movie. Simply because that is what the casual moviegoer would like the most. Even comicfans in general wish for this too.
If they can get this done I believe that will shape the plans for the X-men movies. Otherwise expect some sort of configuration of Cyclops, Jean and some other mutants in either a teen movie or mid 20's. It depends on if the avengers are dying/recasted/replaced after phase 3.
Gambit will probably get made and might have a sequal and will probably be so self contained that it can be made to fit with whatever has happened say 2-3 years into the MCU.