I personally would go to UF from ULL given a chance back in the day when I was aspirational. And yes, you could get fired in 3-4 years, it may even be probable. Mullen was there for four years and won one divisional title, and had three NY6 bowls in four years.
He was fired for some lip, some apparent indifference to recruiting, and going 6-6.
I'm not sure it really was his fault, other than a few casual comments.