I would be willing to bet that when the dust settles, the Big XII will have added FSU and Clemson and 2 others in the future, perhaps Miami, VTech or GTech, for specific reasons.
Reason #1 is that this gives them a foothold in SEC territory. The SEC just invaded Texas by adding A & M, so the Big XII will take the gloves off and add a Florida school or 2, and a South Carolina school. And let the recruiting wars, which are already massive, escalate. The Big XII is making a play to equal the SEC, or come really close, and the $$$ will be LARGE.
VTech will get added simply because they are a football school in the ACC, they are close in proximity to WVU and help with that travel for other sports.
Right now, the sentiment amongst fans at FSU and even at VTech is that they want to join a football conference with hoops, and leave a hoops conference with football. The ACC meetings are going on right now as well, and there have been reports of splits between the hoops and football schools. The writing is on the wall. Word is that even Pitt has reached out to the Big XII, and they just agreed to join the ACC. So they see something is coming.
I think this means that BYU will be outside looking in--again--with the Big XII and the Big East will not be viable either. I also think that these changes will have massive implications because the ACC will then be forced to add some teams, and they will raid the Big East, and get teams like UCONN, Louisville, Rutgers and then perhaps USF.
The only X factor in all of this is Notre Dame. What will they do if the the Big East collapses, and will they be forced to join a conference for football. If so, BYU could be a good partners with them in the Big XII, unless ND decides to entertain offers from the ACC or Big Ten, which would seem likely.
I think BYU needs to decide if Indy is the long term solution, or to form its own new league with western/central teams left on the table.