I'm not saying he's at the level of Urban as a college coach. He's not. But if you take what he did at San Diego and Stanford and add in that he rebuilt the 49ers and took them to the Super Bowl in 2 years, that's a pretty impressive resume in a relatively short period of time. He went 29-6 at San Diego. He took Stanford from 4-8 to 12-1, beat USC 3 of 4 times and won a BCS Bowl. And in four years as an NFL coach, this will be the first year he hasn't been 11-5 or better.
My point is, if Michigan gets him, this isn't as if they hired Greg Schiano or Dan Mullen or Pat Fitzgerald. Harbaugh is a legit coach who has done nothing but win wherever he has gone. This isn't a "wait and see" hire. This would be a big-time get for Michigan.
(And to blow off his coaching experience at San Diego b/c it's an FCS school is a little hypocritical of us considering I seem to remember the Buckeyes recently having a coach who came directly from those ranks.)