Iowa has won 4 out of the last 5 games vs Michigan. This is not just a 1 year problem at Michigan. Anyone can say they will score more points but until they show it on the field it's just words. If one thinks the coach will make the difference his team was ranked 25th out of 32 teams in scoring points per game last year. I don't see him being a big help at all.
Wait, so you're making the transitive leap that because his NFL offense was ranked 25th last year, he won't be able to do anything at Michigan? You can't be serious...
Here's the little bit I know about Harbaugh:
* Got Stanford out of the bottom of the Pac12 in a very short amount of time
* Within 2 or 3 years had them in a bowl game
* Within 4 years had them winning a BCS bowl game (they probably finished top 5 that year, too)
* Ran a very B1G-like offense at Stanford better than pretty much every other B1G team
There is no lack of star power at Michigan...someone posted a chart in another thread about the number of recruits by star level and the 2013 class, in particular stood out. Those kids will be RS Soph and Juniors this year, and there were more than 25 kids, I think, that were a 3.5 star or above...given that the offensive identity isn't making a radical shift (such as it did from Lloyd Carr to RichRod), the possibility is very real that the Michigan offense will be much improved within a couple years, if not next year.
You might not see him being a big help at all, but you're probably in a pretty small minority there, given that Harbaugh was the #1 coaching free agent during the scramble for coaches over the past couple months. Harbaugh could have named his price and went almost anywhere, an opportunity not afforded to someone you "don't see...being a big help at all."