Assuming, of course, that is what happens. It's possible that when we arrive, we don't fall into a body so much as fall into a space, and the universe creates a history for us and places it in people's minds. Since the past is largely dependent on what people remember happening, if everyone remembers false information, then that's effectively what happened. That would explain why these people don't come back when we disappear again: they were never there to begin with, and any observational and physical evidence thereof is a sort of shared dream.