Question: Given that the entire McFly family's circumstances have changed at the end of the movie due to Marty altering the past, shouldn't Marty's whole life have gone down a completely different path from childhood on? What are the odds that he even still knows Doc and Jennifer in the revised 1985 (let alone has the exact same date planned with Jennifer for the very same evening), given that everything else has changed?
BaconIsMyBFF
15th May 2019
Back to the Future (1985)
Answer: The suggestion is given that he was the only "normal" person in the family and when he changed the past his parents and siblings became more "normal" people as well whilst he stayed as he was, despitegrowingup with different parents and siblings, since he was "normal" anyway. This totally ignores the linear timeline idea given during the entire movie, but it's obvious that was the idea.
You're absolutely right about Marty being the only "normal" one in the family, but that doesn't ignore the linear timeline idea. There are two different Marty McFly's by the end of this movie. There's the one we follow, who grew up with unhappy parents, and then there's the other Marty McFly who grew up with cool parents. We see the 2nd Marty go back to 1955 when Marty gets back to the Twin Pines mall. The idea isn't to ignore the linear timeline idea, but rather to imply that unhappy parents or not Marty will still always be Marty.
Except for the fact Marty kept being in danger of disappearing if his parents wouldn't get together. If his old self would disappear from his parents not getting together then so he should if his entire life is different and he would be a different Marty just like his siblings. Even if it's only memories rather than an entire personality.
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Answer: It's definitely a paradox. Marty actually goes back to the life of 2nd Marty, but if that's the case then original Marty should have still faded away since he created a new timeline when he gave George confidence. Original Marty shouldn't exist anymore at all, he should have faded completely away on the stage. I've said it before and I'll say it again: time travel movies are a mess.
BaconIsMyBFF
The new Marty isn't a different person entirely; he's just the same guy who was raised in a slightly different environment to the original timeline. Marty's actions in 1955 have ensured that his parents will have three children, and he will be one of them. His existence is completely secured in the timeline.