Bama boosters could make Saban's life way better than Saban could ever create for himself in Cleveland or anywhere else.
And lol @ "he might leave for Texas"
He would be CRAZY to leave for Texas. At Alabama he is a legend, there's no other pro team in the state, the only other college team even coming close in the area is Auburn. Saban would scoff at whatever offer Texas could throw his way. The Bama boosters would match and then some. Saban isn't going to go to Texas to recreate a legacy that he's already cemented in Bama. He doesn't give a damn about proving his worth in a place like Texas.
What's he gonna do? Go to Texas and wait all year to play whatever great team is coming out of the SEC?
Saban is sitting on the throne at the most successful, most historic college football program in the mecca conference of college football. Anything outside of a jump back to the NFL is a bad move IMO. There's not even a LATERAL move that would compare to the situation that Saban has found himself in at Alabama. It's pro or bust at this point.
If Saban wins another BCS NC, I could see him thinking about making that jump again. However, the Bama family (univ, boosters, faithful) are going to make it more than worth his while to stay there for as long as he would like.