That makes the most sense to me. It's all only going to get worse once Syracuse & Pitt leave for the ACC & I'd be willing to bet that UConn & one other team jump ship to the ACC too, and that'll be the first 16 team mega-conference (disclaimer: not at all an original thought). Then you'll have the B1G and SEC grabbing football programs so they can get to 16 as well.
DePaul, Marq, Creighton, Dayton, X, Butler, SLU - after that you can make your own argument for the rest to make up a 12 team conf. What you are suggesting is what some on here have been saying for sometime.
If everybody raids the Big East for football (which I could see for teams like Louisville, Rutgers & maybe even Cinci), that could be good for SLU if it leaves Marquette & DePaul without a home.