I think it's more key if both his coordinators leave. Caldwell doesnt have this amazing coaching tree he can go pick from to get new coordinators. Lombardi and cooter were both qb coaches without their own playbook. 1 was a huge mistake...1 doesn't understand nfl run game fundamentals.
If both coordinators leave... you absolutely are justified in canning him so you can get coordinators that are worth a shit.
Who's hiring those coordinators though. Caldwell. I just hate the extension because they get to the playoffs now and again.