It's hard to know how it plays out, but I do think there's a pretty big difference between a 14-team league with 2 divisions and an 18-team league with no divisions. Sure, you can adjust to playing Nebraska instead of Indiana, but the adjustments next year are on a whole different level.
Whether they got there, winning the Big 10 west was something to aim for. Sure it was often weak, but for most of the teams in the west there were many more Oct and Nov games that influenced getting to the title game than there is likely to be going forward.
Talking through this, I think there might be a pretty big difference in perception on this between Big 10 east and west schools. I'll grant there's certainly some amount of just hate change component, but to go from a sport that was incredibly regional and based on rivalries to something where a battle for a conference championship bid could likely be between two teams on opposite coasts is a pretty big change. Even pro sports have regional divisions, it's just so bizarre to me for college football to not have them.