Re: X-Men: Part 6 should be set...
I hope after DOFP they just move on to the future.
For me, the ship has sailed for the sequels for First Class, like showing the younger version of Scott, Jean and Ororo. If they really wanted to make a trilogy out of the cast of First Class, they wouldn't bring back the original cast and they would have brought back the majority of the cast of First Class.
And I just can't imagine FOX not bringing back Hugh Jackman, Halle Berry and the other present X-Men after this one especially if DOFP turned out to be a huge hit.