Mack Brown is a very good coach. He brought North Carolina back from the dead and had multiple ten win seasons there, and the run he has had at Texas has only been duplicated by FSU in the modern era of college football.
They are going through growing pains this season after losing arguably the best QB in school history (kinda like UF) and are still suffering from the lack of a running game like they have for the past three years.
They'll get it back to together next season. Mack Brown isn't as old as you'd think, I don't even think he is 60. Muschamp will get his chance, but CMB won't go out like this.