That is the question for Michigan Football. Jim Harbaugh has yet to sign an extension but has already let go of his much aligned defensive coordinator. There are a ton of rumors floating around, with names like Derek Mason and the explosive oil and water combination of Jimmy and Will Muschamp. Mason's name has also being tied to the DC opening at LSU.
One name I didn't consider was former Texas and Louisville head coach Charlie Strong. He is currently on Saban's non-field coaching staff at Alabama. He would bring more recruiting to Florida and is a pretty smart guy when it comes to defense.