There are other Gary Andersen's out there for USU. Ed Lamb may even be one. Yes they'll likely leave after 3 years or so, but you could have a historic season during one of these years.
Coaches like that are hard to find though. Do you risk giving up your head coach who is a decent head coach to go after something like that and potentially do a lot worse? I don't know. I do think the formula of using a polynesian pipeline and RM's can give USU a better chance to have a season like that than a lot of G5 schools.
If Wells has a bad season this year, 2017-2018 will be an interesting year.