I have always been in the camp that this is all eventually leading to 4 super conferences of 16 teams. But I recently go to thinking about it more...and I am not sure if that is even the eventual ending.
I am starting to think that the final realignment will end up with three conferences of 18 or 20 schools. Everyone always says that the B1G, SEC, and PAC12 are the clear power conferences and the B12 and ACC will battle it out for the fourth spot. But if the B1G, SEC, and PAC12 are that much more powerful....why allow a 4th conference to join them? And while 16 teams is a good number (especially compared to 14), I think that 18 or 20 is actually optimal. Everyone yearns for the days of the 9 and 10 team conferences for scheduling and rivalries...you can basically get there with the 18/20 team conferences. You would basically have two 9/10 team 'divisions' that is essentially what a conference was 10 years ago. But you consolidate the content and power into a mega conference. The media rights, revenue, and power these 3 conferences would have would be mind-numbing. I think that eventually you may see the 'power 3' come to this realization and just kill off the B12 and ACC. I know that th 4x16 is the accepted conclusion...but I have to wonder if this may eventually take shape once it is all said and done.