Literally who would they replace him with?

He is the defensive coordinator so not only would you be firing the head coach you be firing the defensive coordinator.

And I think we all kind of agree that Luke getsy sucks too.

They literally can’t fire the head coach. Not without getting an entirely new coaching staff in there at the same time and there’s no way you can do that mid season. You only fire your head coach. If you’re just going to let your defensive coordinator or your offensive coordinator assume the head coach role. But you cannot do that here because they would need a new defensive coordinator