Quoted from Sinestro:
I’ve mentioned this before on Pinside. Everything would click, even the “Who’s President” line.
And I hate remakes.....but this one would make sense.
They could even improve it! Maybe have Marty actually develop as a character! In the present he or she is shy and meet and can't get the attention of a person they like. Then - thanks to their 80's adventures - they learn what it really means to socialize. They return to present and walk right up to the person and ask them out.
Doc could be like a maker type dude and yeah, maybe his intention is to go back to 1998 and buy Apple stock. The terrorist angle wouldn't work (or be allowed) anymore so there's the trick of how does Marty ACCIDENTALLY go back in time which is the brilliant screenwriting trick of the original.
What was brilliant in the original was Marty didn't INTEND to time travel it was a consequence of outrunning the Libyans. What's even smarter is Doc STILL does the experiment even after learning he'll be shot, so he wears a bullet proof vest so Marty STILL gets scared and goes back in time to warn him, thus avoiding a paradox.
BTTF is one of the tightest time travel movies ever. BUT... yes.... still could be a good remake.