That's the thing, right? CU fans tend to look at what we had with Nebraska and say "that's what a rivalry is and anything less is not a rivalry".
It doesn't have to be that way and it's not really the norm.
Look at Washington, for example. They hate Oregon #1, but Wazzu and the Apple Cup is a legit rivalry. And they also will always get up for a USC game like crazy. That's 3 rivalry games that matter no matter what else is going on with the season.
We have that with Nebraska no matter how irregularly we will play. It's going to be like the Arkansas-Texas rivalry, rekindled every now & again and always meaningful when it happens.
We have that with CSU, whether we play them every year or not. It's a game we will always be up for and will draw a big crowd with lots of in-state attention.
I think Utah is there for a lot of reasons, though I acknowledge it's missing the passion right now to be a game that both fan bases will care about no matter how our respective seasons have gone. We're not quite there in terms of celebrating every loss, suspension, bad press and recruiting failure of Utah's. It currently falls short on what I'm sure most of us would consider the most important measures. But I do think it qualifies as a rivalry game.