Re: What is DOFP setting the groundwork for?
I think there should be two primary series from that point onward. One series would take place in the 80's, following the introduction of Cyclops, Jean, and Storm. Maybe a few other X-Men too, like Psylocke, with Fassbender's Magneto as the primary antagonist, but with some Mr. Sinister action here.
The other? Wolverine and the X-Men. Hugh Jackman can keep being Wolverine, only now he's in charge of the Xavier School, running it. You can focus on Rogue, Kitty, and Iceman, along with Collossus and what have you, and any new mutants. That way, Jackman can keep playing Wolverine, since the public loves that role, with smaller parts devoted to the original team on occasion.
...and Deadpool is a must.