maybe we'll see part 4 in 2019 (30th anniversary of II)

Biff played by Trump
Doc played by Bernie Sanders

BTTF (2) getting lot of things right recently and is always getting tweeted about. Maybe they should do part 4

sounds like a creepy realistic take on BTTF - like Primer, Predestination etc

https://www.reddit.com/r/movies/comments/4taavr/movie_idea_another_back_to_the_future_movie_that/
Movie idea: Another back to the future movie that is actually set in the year 2015 but the twist of the movie is that Doc and Marty actually arrive in 2015 but the town that they arrive in is a town sized theme park based on the movie, back to the future 2. (self.movies)
https://www.reddit.com/r/movies/comments/4taavr/movie_idea_another_back_to_the_future_movie_that/d5frlbh
The Back to the Future universe is one of the few good projects I would be okay with rebooting, and doing it on considerably different and darker terms. Here's my concept:
We discover that the original BTTF films were drastically censored adaptations of a memoir discovered by Robert Zemeckis (this part of the story is similar to the concept of Wes Craven's New Nightmare, in bringing the filmmaker into the story). He wanted to show the stories in an upbeat way, but instead we are taken into the "true" story
The "real" Marty, let's say "Marty McFadden" - a realistic-ish 1980s teenager who calls to mind iconic John Hughes characters rather than being light-heartedly whacky like Michael J. Fox, is indeed sent back to 1955, but it's a realistic 1955. People don't act goofy and aren't constantly reminding you what year it is.
Anyway, he changes history, but instead of that ridiculous thing with the fading photo, it just means the future he returns to is different. Maybe his parents still got married, but the events were somewhat different, so they never had him - they had different kids, and don't know who he is.
So he goes back in time to stop himself from causing the changes, but that just introduces more changes. And he goes through these increasingly desperate cycles of trying to restore a situation that is now completely gone. He is a stranger, alone in time, who has erased himself from history, and after countless back-and-forth cycles trying to rediscover his life he is middle-aged from living the same few years over and over.
Finally, at some point in the '90s, he powers down the time machine, removes and destroys some critical components, and goes to a bar. He looks around and realizes with shock that everyone in the barand everyone on the street tooare his children or grandchildren from one cycle or another.
He smiles and drinks his beer.

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No, no, no, and no The BTTF trilogy does not need any more sequels, prequels, remakes, or reboots. Hollywood should leave it alone FOREVER. It is perfect as-is.
People should be demanding that Hollywood come up with more original ideas instead of sh!tting the bed with countless horrible sequels/reboots that ruin a franchise.