A 100,000+ seat stadium and a high visibility history will attract a so-called 'power' coach and the program will return to glory eventually. But it may not happen for the first coach they hire.
When Woody left the game, a lot of
OSU folks wanted Lou Holtz, who had wanted tOSU job his entire life. But he wouldn't interview for the job because he didn't "want to be the coach who followed Woody Hayes", he wanted "to be the coach who followed the coach who followed Woody Hayes".
You may see that phenomenon happen in Happy Valley. The immediate successor can't possibly live up to expectations, so the school moves on a couple of years later to the successful successor.