I have to get Doogie's back here - I also agree he has little pressure here - and I have said he has no pressure here (actually just today) in comparison to the Kentucky's, Wakes, UNC's, etc. of the world.
I think when you look at the pressure (quite honestly, if he takes us to the tourney every year, wins a game or two in it, he's golden), the money he makes, the quality of life he has here - which included living in a metropolitan city, and the fact that most fans here thing Tubby is a god...I honestly don't think there's anyway he chooses to leave, unless there is no progress with the practice facility.
Look at it, since the 1990-91 season, we've been to the tourney 3 times, as far as the NCAA is concerned, 2/3 were under Tubby. It's not like this is a school that has a basketball tradition of going every year, and multiple runs to the Final 4 and Elite 8. Can we get there? Absolutely, but it's not an expectation right now, it's a goal.