They'd hype their students and fans to get there early, and keep it red. No doubt about it. What would BYU do if Gameday for a Utah game was in Provo? Hype the fans up and tell them to keep it blue no matter the case. I've also been to several games in RES and I know what they won't tell their fans, cause they don't need to, get in the face of BYU fans, be obnoxious, make them feel uncomfortable. To any BYU fan that goes up there, in this hypothetical situation, you will not be welcomed with brotherly hugs, you will have to fight for your spot and put up with a lot of crap the entire time you are there. People who know this, probably won't bother going.