more franchises with a bunch of different timelines or at least vastly different placements in time should have something that is a kind of distant future to all of them that brings the whole series together at the commonalities between em and reflects on it as A World That Is The Endpoint Of The Whole Deal, no matter if Muh Muh The Timeline Doesn't Make Seeeensssse.
theres several of these i can think of and knowing y'all you probably know a couple too! i just think, y'know, it would be cute if there were EVEN MORE. fanfiction writers, get cooking.