That's all well and good, but at the end of the day it's a state university with an already strapped budget. As such, they can't afford him if he's that successful. Also, a great majority of people will take a job with what is viewed as a more prestigious company at a much higher rate of pay. I wouldn't expect Groce, as much as I like him, to do anything different.
There are the Larry Kehreses of the world that have found the life they want and are content with remaining in a place regardless of other opportunities placed in front of them, but they are pretty damned rare. Maybe the OU-->Illinois experience will help to give Groce that perspective, but it's unlikely given simple human nature and UA's budget restraints.
P.S. I'd be surprised if he went anywhere after this year.