Originally Posted by
vitruvian
For Reed and Sue to have a kid after they got married.
Oh, you mean in-universe, not from the writer's perspective. Answer: we don't know. We also don't know that Franklin doesn't survive to grow up, either. Either the future times Cap visited could turn out to be the recreated universe (it's not like anybody's ever had any trouble traveling past the point in time where Genis-Vell rebooted everything, either), or, since there have been any number of alternate futures with a grown-up Franklin (including DoFP, the variant of that one that Hyperstorm came from, etc.), it could just be that particular version of future Franklin who doesn't happen, which wouldn't bar actual Franklin from surviving at all.