I'm assuming you are more well-informed than any of us, but this feels more like a "lack of institutional control" type situation. Either the staffer went rogue or he did it under instruction of Harbaugh. At some point, it has to progress to further punishment to institutions rather than just to the coaches. Otherwise it just enables this type of behavior. The coach either leaves on his own or gets fired for cause. The university doesn't face any consequences then, and are free to repeat.
I get the whole not wanting to punish the athletes, but with the transfer rules the way the are, a bowl ban, a coach leaving, and scholarship reduction wouldn't hurt any player unless they literally can only play at Michigan.
On the other hand, the NCAA has no real power. And any show of it would get challenged legally. So it's probably stupid of me to expect anything other than a wrist slap.