That's not how it works. When conferences make these decisions it's based on the home media markets, not where the fans are. College sports are regional because college graduates move. You start talking about where fans are then you get things like KU claiming pieces of Chicago and K-State claiming a part of DFW.
Thinking about this last round of expansion/realignment, the only school added to the Pac 10, ACC, Big 10, and ACC that was about football and not media markets was Nebraska possibly Utah. The Big 12 schools added were bad adds because they were football adds and not media market adds. I suppose you can claim that the Big 12 added WVU for Pittsburgh but, uh that's weird.