SB Nation's Oregon blog Addicted To Quack has a round table of their writers discussing Pac-10 expansion.

It is a good read and here is a piece from their discussion.

You know the more I think about the more I like the idea of adding BYU and Utah. I like the rivalry part, BYU has a strong following and a decent academic record. Also, I think stealing them from the MWC will be a hell of a lot easier than CU from the Big 12.