Maybe I wasn't clear enough, clearly it isn't the ONLY reason they are STILL relevant. But it is very unlikely that they are relevant today had he not coached there. Even very good coaches would struggle to take a team that was such a door mat and make it a contender. Stanford has a lot of things going for it, so it is likely to stay in the picture for a while, but it took someone to bring them back up. Clearly David Shaw is a good coach, because bad coaches don't win consistently, but his job at Stanford is a lot easier than Harbaugh's was.
My main point was that people who have knocked Harbaugh because his overall record is not that impressive are being willfully ignorant of the direction the programs he coached at were headed prior to his being there and where they were by the time he finished. Who knows what will happen at Michigan, but I am just saying that Harbaugh is the best coach they have had in quite some time. (I know the bar isn't that high)