Oh, how i wish that had been the case. I wanted him back so badly when he was gone and wound up wishing he had never returned. They ruined him for me and I find that much worse than killing him. Then again, they were never going to leave him dead long term. Well, maybe not. I would have thought the same about adult Jean and she still isn't back on a permanent basis.
I think Quicksilver should come out as bisexual. I think there is some inkling that he isn't as heteronormative as he tries to be, across various media depictions of him. But then, I think a lot of characters are probably less than heteronormative than they let on.