I would imagine Louisville fans with dreams of long term major football are feeling more and more impatient for the Big 12 by the day.
Any football boost the Big East got from adding Boise State, Houston, and SMU has pretty much been watered down with Memphis, Temple, SDSU. Navy has been solid lately, but long term they're not a power add for a BCS league either. The open invite for Villanova to jump straight from FCS to BCS AQ is still on the table as well.
I believe UMass is scheduled to join the MAC in FBS football in a year or two. Why not just go for them while they're at it? I'm not sure if Army is still considering, I know they were offered.
The minute the Big East is stripped of a BCS AQ, my guess is the western and Texas teams reconsider the MWC/CUSA merged conference because it would be better for them.