In advance, if a mod redirects me to another existing topic: Thank you!
According to the canon, the Vault Dweller vanishes from Arroyoro near the end of his life: What do you think happened to him?
Personally I think the answer could make for an intriugeing, and original fallout 4: because the more you advance in time in a series the more problems you cause by keeping characters and factions alive, and I doubt that Bethesda will let the Enclave go anywhere.
Personally, I think he either went back to the Vault, and tried to get in, I think that he probably would, if he didn't kill the overseer, at least.
Or maybe he went on to have a second family out in the wasteland, mentoring a new adoped son, and possibly helping him overcome impossible odds to save the world in a discreat way, or just complete lots of side quests. Or maybe they created a cure for this or that. Or maybe etc.
I understand the canonical poblems a game like this would cause, but it seems like such a neat use for the Fallout 3 engine.