[chii]

> who will produce food

the people who have not yet FIRE'ed would have to do it, and they do it because they are getting paid by people who are FIRE'ed - presumably, with the intention of FIRE'ing themselves after reaching some target net worth. Unless you're claiming that somehow the population would stagnate and no new people would be born, this will continue to work.

Why does it have to be possible for _everybody_ to be in the same position, at the same time, for FIRE to work?