>>2508324However, if you take their timeline as reference, it still has an end. After this point, they will no longer exist in ANY timeline. Even if you go back to one of the previous ones, they will not have experiences of the timeline that just passed.
Think of it like a river branching multiple times into the ocean. It always end at one point, and even if you go back and go on another branch, the views are different despite being technically the same river. However, it all doesn't matter because once you reach the ocean, the river ends.
