San Diego St has made no secret of their desire to move to a power conference. I believe they do have an invitation to the Big 12 in hand but may be waiting for the Pac 12 to iron out their contract. I think that would be their preferred destination. Like most things money is at the root of it all. If they officially retire from the MW before June 30, they will be responsible for a 16.5 million exit fee. If they don't officially leave by June 30 they have to pay 34 million to skeedaddle. They have asked for a 1 month extension to retire at 16.5..I am not sure the MW will give them that extension.
There will be fallout but that pretty much all depends on what happens with the Pac 10.