Did Crispin Glover actually have a point in that the ending sent the wrong message?
I think that he wasn't satisfied with how George and Lorraine turned out in 1985 after Marty's actions back in 1955 altered the course of the McFly family's history. In the eyes of Glover, it gives off the impression that we're supposed to automatically accept that the McFlys should be happy with their lives now that they have some money:
https://www.reddit.com/r/movies/comments/cn6oh1/which_film_delivers_the_most_terrible_messages_in/ew83f07/