Watching USC get beat twice last year by Utah, makes me think they will struggle more than most think.I do think it will be more of a struggle for UCLA & USC than Washington & Oregon long term. I think They can all assimilate more like Penn State did than Nebraska due to their current state.
No one besides maybe UCLA will struggle as much as Nebraska did joining the Big Ten imo. Nebraska's failures are far less what the BIG did and more on what Nebraska didn't do.
Utah plays like a Big Ten school and couple that with the fact that USC will likely have to play cold / snowy road games in November which will create challenges for their offense.