"Several psychologists have studied fan loyalty, and what causes a person to be a loyal fan, that sticks with a team through adversity, rather than a fair weather fan, that switches support to whatever teams happen to be successful at the time."
or this gem:
"Fair Weather Fan: A fan of a sports team who only shows support when the team is doing well. During hard times they usually bandwagon other teams. They basically have no real loyalty to the team"
If you're cheering for BYU, a team that hasn't been elite since the early 80's, based on them being a college football power, then you'll be better off mentally cheering for Ohio State.
There's nothing wrong with that. But it is, by definition, fair weather fandom.
Side note- I tried picking out a second team to root for during the offseason, but just couldn't bring myself to do it. Felt like I was cheating on the Cougs. They break my heart every year, but I just can't quit 'em.