I'll admit that I tend to doubt that Muschamp will survive simply because Florida hasn't shown much signs of improvement and because of (1) overall strength of schedule, and (2) the SEC East, although not featuring a single really good team, has several solid teams that Florida will struggle to beat.
Hoke, though, may find a way to make it another year, I think. Not that he's a real solution in Ann Arbor or because Michigan will improve dramatically between now and December, but when you look at their remaining schedule it's very soft. Michigan State will be tough, and Ohio State will be a bit of an uphill battle, but otherwise... Minnesota, Rutgers, Penn State, Indiana, Northwestern, and Maryland? Hoke could reasonably get to 8-4 this season due to the overall weakness of the B1G, and I think that would be enough to save him for another year.