Days of Future Piff
Superstar
Nobody wants to see that
I'd watch it
But no one else will be excited
Only way I see it working, is to have the O5, but introduce some of the All-New Xmen in the same movie
Next movie, have some of the O5 leave the team and introduce more
I'd like to see O5 era > Australian era > Gold and Blue era > Krakoa
But I know that's not going to happen
I would start with Giant Sized X-men 1 and splice in flashbacks to the O5 and their origins. Kind of like the way The Godfather 2 did things.
Then do a movie with the Paul Smith lineup, an Australian Outback movie, and finally the 90s Blue/Gold team.