I understand why the Big 10 wants to expand. They have their own network and want to sell it in more markets. For them expansion makes sense. I doubt the SEC will expand because they already have their own monster TV deal. Why split it more ways? But if the future really is super conferences, then the ACC should be both bold and proactive.
They could just absorb the entire Big East football conference. That would give them 19 teams (assuming Rutgers to the Big 10 and it leaves a spot open for ND). Football that breaks into a 9 and 10 team conference with a true championship game. Basically it would be two conferences within one that has a championship game to decide the winner.
But why absorb a weaker league? Why give up the extra BCS money? Because you would control the entire east coast which has 40-50% of the population. If you can add ND to the mix you are suddenly very competitive for TV contracts. You would also own basketball. Every year the ACC would have 2-3 teams in the final four. How big of a TV contract could such a basketball force demand? You could also do what the Big 10 did and create an ACC channel. With nearly 20 teams and the entire east coast you should be able to not only support it, but get it to thrive.
Just trying to think outside the box.