Tuberville is so stupid that he doesn't recognize the difference between a contract and a personal promise or commitment.
The contracts between a coach or player and a university all have outs, like a buyout clause or provisions allowing players to transfer freely. From the court rulings, clauses absolutely prohibiting a player or coach from going somewhere else are surely unenforceable anyway, right?
If you want to see what happens when a school doesn't take advantage of the new environment of NILs and so forth, here's an example:
Don Brown's wife Deborah wasn't happy about his firing from UMass, suggesting he was at a huge disadvantage financially.
www.si.com
EDIT TO ADD: This recent article seems on point to describe the changing relationship between a player and university:
NCAA getting rid of National Letter of Intent program
sports.yahoo.com