My first instinct is that everyone should have one rival, but the reality is a some are going to have 2 (ie, K-State with KU + ISU) while others might not have one that really makes any sense at all. It sucks
I'm happy with getting a home & home with everyone at least every 4 years and they didn't go with pods another strategy that means some schools don't see each other very often at all.
I tend to be the opposite. I don't care as much about seeing other schools as often. College sports is built upon those longstanding rivalries that we want to see every year and those deserve protection even if it means you don't see some other matchups as often.