Never quite understood Glover's stance on the ending of BTTF. To me the main take away was George's new sense of confidence and belief in himself lead to a better life for the whole family. Yes, more money was part of that, but it was a by-product of both George and Lorraine being happy with themselves and each other that lead them to make better decisions and just be better overall people. I could see if they were in a huge mansion and really seemed to be flaunting their wealth, but really the only thing that was different materially was they had some nicer clothes and furniture. Marty also has a truck now, but that seemed to be less about wealth and more about the fact he was going to be able to take Jennifer up to the lake, now.