Saban to Notre Dame

I have read on here several times that that scenario would not happen. My question is why not? If I was the AD at Notre Dame and had a bag full of cash, I would throw it at him plus some as I would go after the best college football coaches in America, and he is one of them. I doubt that he would take the job as I feel he has learned some what of a lesson from the past and realizes he is in a good position, but you cannot rule out the possibility.