Fair enough. I'm just cranky tonight
I'd find it more fun to discuss a plot that doesn't have to "reboot" or "invalidate" anything already established myself. I think a second movie should juxtapose Xavier recruiting more X-Men and Magneto recruiting mutants for his Brotherhood. Once again focusing on their relationship but this time the start of them being enemies.
But they're not really enemies yet, are they? More estranged ex-friends. Besides, even at the start of X1
, Wheels and Mags are able to have a reasonably friendly talk.