So, for his New Avengers run, Hickman got pretty much everyone he wanted- Strange, Iron Man, Namor, etc, except for the X-men characters. Originally, Xavier was supposed to be part of Illuminati, but he was killed in AvX (ironically, since Hickman was the one that brought up "What's Xavier role there?" according to him). After that, he wanted Magneto, but since it wouldn't fit with Bendis All New X-men run, Hickman used Beast instead. And it was pretty clear it was the Illuminati member he was least interested in and played less of a role, IMO, and I think few will disagree.
So my question is, how do you think Xavier and/or Magneto would have changed the story? What impact would they have? And Magneto specifically would have been eager to blow up worlds and joined with Cabal or would he have been more restrained?