It's not just Cook. It's the ripple effect which may follow. As of right now I'd say UF will miss on Cook, Ermon Lane, Adoree Jackson, JC Jackson, Chris Lammons, Jamal Adams, Lorenzo Featherston, Lorenzo Carter, Travis Rudolph and Jalen Tabor and De'Vante Phillips (2015). At one point or the other all of those players either committed to UF or named UF leader/co-leader. That is going to hurt. Moreover, Muschamp apparently didn't have much of a back up plan for many of these guys....which is illustrated by several of out of state offers given out this week to prospects who didn't even have UF on their radar before now.
Regardless of whether UF turns it around on the field next year, the talent in this class (or potential lack thereof) could determine Muschamp's fate.