It’ll survive this because a lot of Reddit users don’t directly use this party apps or the API and genuinely don’t understand the problem.

What might kill it is if the quality of subs degrade because moderators can’t manage them any more.

That’s probably not a problem for really small subs (easy to ignore the noise, not particular attractive to spammers), but could cripple big ones.

But it won’t be a quick death as everyone leaves in protest, because they won’t.