I think the SEC has a great shot at taking Florida State, Miami, and maybe Georgia Tech and Clemson and eviscerate the ACC. The ACC might fall apart or 'move north' absorbing the Big East leftovers that the Big 10 didn't want.
Everyone assumes this but why? Why does the SEC have a "great shot" at taking those schools? I don't think they do. Miami has already turned down the SEC when Arkansas joined in favor of going to the Big East. Now that it is in a much more prestigious conference academically and makes nearly as much off the TV contract, what incentive does it have to move? I'm almost certain they turn down any invitation. Florida State is in the same boat as Miami, they also said 'no thanks back in 1990' and are now apart of a more prestigious academic conference that pays almost as well.
Clemson is a school that might listen to the SEC calls, but it's a founding member of the ACC. It will have to ask itself if breaking all it's traditions and attachments to a more prestigious academic conference is worth about $3 million more per year...I really doubt they can say yes, especially if Miami and FSU have already said no.
That leaves Georgia Tech, the most likely of all the schools to accept an invitation, mainly due to its past affiliation with the SEC. So that makes one...possibly.