I think that the jury is still out on Muschamp as a head coach. He certainly failed at Florida, but he handled that failure about as well as any head coach that I have ever seen. Go back and watch his presser after he was dismissed. He took complete responsibility for the teams' failures and accepted the result as well as anyone could have.
Yes - he is a hot head, but so was Saban for most of his career. Heck, many of the best head coaches in football get pretty animated on the sidelines. As long as Muschamp properly focuses that anger, I don't see it as a problem.
Muschamp will get another shot at a head coaching gig. When he does, we'll find out if he learned anything from his initial failures.