I think this is a good move for Bohl. Not much left for him to accomplish at NDSU. He can only go down as HC there. Wyoming provides a new opportunity, and Wyoming is not tha far away from being a bowl team in FBS. Being able to win the MWC yes, but not going 6-6 and playing in a bowl game.
He also will make double his current pay, with opportunity to make 3 times as much. And, he still stays in a part of the country to which he has strong ties, and where he likes living. If it fails, he can always go back to being an assistant if he still desires to coach. And, given his track record, I'd bet there would be plenty of FCS teams willing to hire Bohl as an HC. Or, he could retire.