If they did do this, as an old comic book fogy, I'd like to see the original X-Men (you know, Jean, Scott, Bobby, Hank, and Warren) start off the show - - at least for the first season. If it was successful, then they could bring others in such as Havok and Polaris and maybe eventually get to the All-New, All-Different X-Men that were introduced way back in the 70's in Giant Sized X-Men #1.
I doubt this would happen as they are not trying to draw an audience of old-timers like me. They are looking for the young, hip crowed and will have half a dozen (or more) of the only the most recent and most popular X-Men mutants running around. However, with the original 5 in the current modern continuity, it could still happen, right?