This is where I feel Bendis is going with his current run on All New X-Men. I think it was in issue 2 that Hank (present) told the past Xmen that Charles could easily erase their ever meeting him from their minds. SOO, I'm going to bet that at the end of the arc, when the past X-Men are returned to their proper time Xavier is going to erase the memories of the whole event from their minds but not before taking a look around and seeing that Scott is going to eventually kill him.
That part I feel fairly certain of, but on a further limb, I think this gives Marvel their out for when they inevitably bring Professor X back. Since he knows the circumstances surrounding his eventual confrontation with Scott and his "apparent" demise, we (the readers) will find out that Xavier had a plan to circumvent his death for years before AvX and that he never actually died during the event.
Well, that's my theory. What's everyone think?