Dantonio has been a solid coach for MSU. You can't deny that. he's 51-28 there, which is one of the better %'s in MSU's history.
in the end, MD's coaching ability is going to keep MSU solid under his tenure. If Bollman actually screws things up bad enough, you can bet MD will fire him quickly. He's not going to keep him around. and at least it probably wasn't a bad move as far as coaching staff chemistry goes... they obviously got along at ohio, or Bollman wouldn't have been considered.
But at the same time, I doubt Bollman is going to do much to improve things there. Looks like Bollman was actually OC for Tressel's entire tenure, plus the 6-6 shit-show with Fickell as HC in 2011. If the guy was really legit, or anything more than a "Yes Man" he would've moved on to bigger and better things sometime during the 00's, especially after the Troy Smith Heisman season in '06. ...but I think most GM's or AD's out there knew what was really going on behind the scenes in Columbus during those years. There's a reason Tressel never won Big Ten COY, and it's because everyone knew he was dirty and by association... so where his long time stalwarts on the coaching staff. they don't give out awards for that.