The other possibility will come from a idea within Endgame by itself. The closest that Marvel’s Infinity Saga summary will get to addressing the “rules” of time journey is by way of a conversation amid Scott Lang, James “Rhodey” Rhodes, and Bruce Banner. All a few men have their thoughts on time travel, but the film offers Bruce the final term, subtly suggesting that it’s his interpretation that is appropriate. Right here is what he has to say:
“Time does not do the job that way. Shifting the past doesn’t change the future. Assume about it, if you travel to the earlier, that past gets to be your long run and your former current becomes the past, which just can’t now be altered by your new long run.”
Let us call this the Subjective Idea of MCU Time Vacation. A selected type of time journey is allowed and effective as prolonged as the time traveller understands that the character of time arrives down to their subjective practical experience of it. Bruce Banner can’t make a new timeline when touring to the earlier because he’s aware that the earlier is now a part of his personal subjective potential. As lengthy as his tale ends up in which it is meant to be, which is to say activating the Infinity Gauntlet in 2023, then every little thing will be okay.
And that delivers us to a selected time touring lothario…
Why Didn’t Steve Rogers Produce A New Timeline?
The idea that Steve Rogers didn’t produce a new, unsanctioned timeline by residing out an fully new daily life with his lost adore Peggy Carter is truly baffling. If Loki can develop a Nexus celebration by choosing up the Tesseract, how can Steve Rogers abandoning Captaining America in favor of smooching Peggy for 50+ many years not?
Nicely, it’s possible we can make feeling of this by combining our two theories above. For starters, the Sacred Timeline has to accommodate for other lesser, sanctioned timelines inside of itself – it just has to! Any determination you do or do not make makes new prospects and new universes. When you opt for to don a blue shirt in the early morning as opposed to a pink shirt, you are developing an entirely new unseen universe in which you wore that crimson shirt (and almost certainly gained the lottery or some thing, I don’t know).