It depends when it occurred. I don't see mere capital as a sufficient way to secure the network in a world of infinite fiat but if we were on a bitcoin standard and had limited supply money that people/governments can't manipulate and acquire for nothing, it might be more feasible. There still would be a concern over a nation state being able to acquire a massive amount of stake by confiscating it from its citizens.

Maybe some sort of hybrid of PoW/PoS will emerge at some point.