Re: How should they handle Wolverine in this movie? (if he had to be in it..)
It wouldn't be Days of the Future Past if we didn't see future Wolverine's death, that scene is iconic. I also loved in TAS when the sentinels were walking Wolverine and Bishop to dig their own graves and as they pass the X-Men's graves, Wolverine sees Jubilee's tombstone and you can see the anger and grief hit him.
I would also prefer if the time traveler was Rachel Summers or Cable and they made a stop in the "present" to recruit Wolverine and Storm.