As far as I recall the Idaho fans were split, but the ones against moving back down were very vocal. I imagine App State is probably happy where they're at, and I think that's largely a matter of circumstance - in particular, they found their way into a league with a lot of local (and traditional) rivalries. A comparable situation for UM would to somehow build/ get into the hypothetical "Snow Belt" conference with MSU, Idaho, NDSU, SDSU, ND, SD, and maybe a few others. IF we were in some FBS league with a bunch of regional or traditional rivalries, sure, the games would be fun. That said, App State is certainly losing much more than they used to, and they're in a much better recruiting spot than we are. It's all a balance.
TLDR: I'll enjoy Griz football no matter what.