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Originally Posted by Hemi-Cuda
I don't really buy that. First, they explain at the start of the whole time travel plan that the timeline is self-correcting, if they went back to kill Thanos someone else would have just taken his role, so just by going to the past wouldn't automatically spawn a new reality. Second, the Ancient One plainly states that it's only when an infinity stone is removed from a timeline that an alternate reality is created, and if they get returned then the timelines revert back to a single thread
I actually think his 2nd time travel method is the more likely one, immutable time travel. That explains Steve going back and marrying Peggy, that was always going to happen and there has always been an older married Steve in hiding during the entire MCU. The only hole in this theory is the younger Thanos leaving his timeline to go to the future and then dying, but I think that can be explained away with the Soul stone. When Steve returns it, Red Skull could state that by doing so all the souls it holds will be released, so Thanos and co. get unsnapped and that timeline merges back with the main one
I think the only timeline that is still separate from the main MCU is Loki with the Tesseract, which will probably be what the TV series will cover. I wouldn't be surprised though if by the end of that, he ends up returning the tesseract from the timeline he took it and everything merges back to a single thread
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I can see where you're coming from, but IMO that's actually not what Bruce Banner said.
If I remember correctly, this is how their conversation went:
Warmachine: "why don't we find baby thanos and *strangle him*"
Banner: "first of all, that's horrible. Secondly, changing the past doesn't change the future"
Antman says they should go back and steal all the stones so thanos has no stones
Nabula then agrees with Banner by acknowledge that's not how it works.
Warmachine then qoutes a whole bunch of movies
Banner: "I don't know why everyone believes that, but that is not true." Then he explains that "If you travel to the past, that past becomes your future, and your former present becomes the past" so it cannot become your new future.
By going back to the past, they are not going back to their reality in the past, but an alternate reality. Banner even questioned why everyone was quoting all these movies because that is not how time travel works as he understands it. He also made it clear that the past they interact with won't affect the current reality past. I tend to believe the video's theory, as I find it also doesn't conflict with the Steve Roger's final presence.