Here's a fun/interesting thought...
Let's just say that the Big Ten decided to take Virginia and Georgia Tech as schools #15 and #16. They get their academic excellence and east coast media presence they've been looking for, so we'll call them good.
Let's also say that the SEC decides they want to expand as well. Everyone (including me) thinks that the SEC would be a quick and easy dance partner. I think they could be. But their problem is #16. They can't just take NC State because of how badly UNC infests their Board of Governors. It would be extremely difficult to get them out of the ACC if that would somehow put UNC in a bad situation.
In nearly every realignment scenario out there, the SEC attempts to get a school from North Carolina. Well, what if the Big Ten takes two more, and some of the teams see the writing on the wall and start to make plans? If you're UNC, do you bail, and if you do, do you bind yourself to Duke? More importantly, if you're the SEC, do you take that package?
Considering the money that the SEC is looking to make is in the T2/T3 area, adding two gigantic basketball brands like UNC and Duke would be very valuable. KU proves that basketball can be more profitable than football in T3 if you are one of a handful of schools. Well, UNC and Duke are two of those schools.
Also, think about a conference that has Kentucky, UNC, Duke, and Florida. Then look at Missouri, South Carolina (Frank!), Vandy, Alabama (Grant!), Arkansas, etc. You can create a fairly valuable hoops commodity for ESPN and the SEC Network with all of that content. Sure, there will be a few dogs in there (Georgia, Miss. St.), but overall, that's a really salty conference with a lot of games in major population centers.
On top of that, should the SEC win the football title again, that would be seven straight titles. However, if Duke and UNC went to the SEC, they could claim 6 of the last 8 national titles in basketball as well.
One of the things the SEC likes to brag about is that it's the "Strength Everywhere Conference". If they took UNC and Duke as a package, they may be able to corner the market on hoops as well.
It's a scary thought. Especially when ESPN will have part ownership and operate their T3 network. That conference, with the full weight of ESPN behind it, would just race past everyone faster than they already are.