Harbaugh has done a great job at Stanford. Stanford is [somewhat] like U-M, but has fewer institutional advantages. Harbaugh would be a good coach for U of M.
Martin in 2007: RR has done a great job at WVU. WVU is [less so] similar to U-M, but has fewer institutional advantages. RR would be a good coach for U-M.
I would quibble with my assertions about how comparable the institutions are (you are probably thinking academics - I would say WVU is easier to get non-academically-oriented football players into, but Stanford has girls and weather). But the main thing Harbaugh (or fire RR) people are missing is that we are not in the post-Carr vacuum anymore. RR supporters are supporting the coach who wants to be here and continue to build on the consistent improvement that has occurred over the last two years.
Who is the best guy to coach this team right now? Rodriguez. When his team demonstrates inexplicable falloff (like if they do worse or no better next year despite having everyone back) I will agree that it is time to move on. But you don't bail on consistent improvement.