Very good point. The time zone thing is manageable with just USC and UCLA. You would have only a few late games.
If that is a concern with the BIG, although I poo pooed the idea at first, Clemson and Florida State might be in the mix. That would also open the door for Notre Dame and dare I say @jimmykc alma mater? I think that makes a great 20 team super conference.
It's a challenge. Because ideally you want to play earlier west coast games, but I know some friends from places like Arizona State and it's 100+ degrees some days at noon during football season. Which is why they play their games so late. It's a balance between safety and optimal viewership timeslots.