you ain't going nowhere, you still need to finish your Terminator theory applied to the X-Men.
Very well then, I shall elaborate on that. Kara observed that when sentinel future Wolverine (Wolverine A) returns to his future body at the end (the body which is actually the aged version of the body he had jumped into in the 70s, Wolverine B) he replaced/wiped out the consciousness of Wolverine B. That struck Kara as a sad thing and he wondered why Professor Xavier didn't appear in any way uncomfortable with the idea.
This notion seemed comparable to the Terminator theory a few of us discussed in the T5 thread about how the paradox of John Connor existing before his own dad (Kyle Reese) could not have always been the case; how there must have been one original John Connor born to Sarah Connor and yet fathered by an entirely different guy, this version of John Connor is not depicted by any of the films. When
that John Connor sent Kyle Reese back through time to protect his mother from a T-800 he didn't bank on Kyle Reese ****ing his mother. Because Kyle
did do just that and got her pregnant, an entirely new person came about who Sarah decided to call John, being none the wiser. She assumes that this is
the John Connor that she was supposed to have. She never meets the original father and thusly that first John Connor is inadvertently wiped from existence because Kyle Reese couldn't keep it in his pants. No one has any knowledge of this original John Connor, the poor guy is gone forever. Like Wolverine B he was an innocent casualty of timeline meddling and the good guys sort of have a hand in this and that's a sad thing to contemplate.
But anyway, my counter suggestion to make it seem more palatable is that Wolverine A and B are merged rather than B being erased. All memories will return and Wolverine will now have awareness of 2 timelines.....maybe.
credit to Difabio for Terminator idea