Would Ralph pay the 15-year contract that ND gave Weis received earlier this year? Not likely. Plus, Weis now runs the ND program. He controls what players he wants. Doesn't have to deal with idiotic attitudes, contracts, etc.
The ND head-coaching job is one of, if not the most, prestigious college head coaching jobs. It would have to be an offer of incredible amounts of cash, and power, to take him away from that.