Yeah, assuming the SEC is going to match whatever expansion the B1G does, I don't see FSU or Clemson going anywhere but the SEC. UNC is probably more likely to go to the B1G, along with Miami, as I don't think the SEC will care to have 3 FL programs, although, maybe they want to block any kind of recruiting in roads into Florida from the B1G.
B1G goes with Notre Dame, UNC, Oregon, Washington, Stanford, Cal as the surefire next 6 that I don't think would be candidates for the SEC one way or another. Maybe UNC would, but they seem like a much better fit in the B1G. With 2 spots remaining, there's Utah, Virginia, Miami, Arizona, GT and CU that are probably the candidates logical candidates. I would like to say CU and Utah bring the markets and MTZ, along with being travel partners, a bridge to the West Coast, and would form a nice clean 8 team "West Division" with the CA and OR/WA schools.
In that scenario, the SEC would then go Clemson, FSU, Miami, and ASU (gets ESPN/SEC expanding West into a big market) to get to 20 and still have 4 spots to fill between Virginia, Oklahoma State, Arizona, GT, SDSU, Pitt, WVU, and VT. Feels like UVA has been mentioned as a sure fire expansion candidate for someone. Would the SEC want to encroach on B1G country by going up to Pitt? Give ASU a travel partner and add to their MBB portfolio with Arizona? Do they try to get a foothold into CA with SDSU? Those 4 would probably be my choice, but I guess they could further saturate the South with adding GT or bringing the WVU/Pitt rivalry to the SEC.