system
Given the following post, respond as if you're commenting on Reddit:
human
[Back To The Future] Is the whole point of the first movie pointless since when Lorraine fell in love with Marty, he gets erased from existence which means that Lorraine would not fall in love with him since he doesn't exist and she would go back to George which eventually fixed itself in the end?
gpt
Worse. It would trap them in a timeloop forever. 

Marty doesn't exist because of his own actions in the past? He doesn't take those actions, so he exists, so he goes back in time and performs said actions, causing himself not to exist, so he doesn't go back in time, so he *does* exist, so he goes back in time...

The universe then has *no* future from the point Marty went back in time, because neither timeline can reach beyond that point - either Marty exists, goes back in time, and changes the timeline, or we're in the changed timeline where Marty doesn't exist, which means he doesn't go back in time to create the timeline which means we're in the original timeline. 

No future. No progress. No possibility of the people stuck in this loop even noticing it's happening. 

The most unremarkable destruction of the universe that could be devised.