I would be surprised if any other school in either SC, FL, GA, or perhaps even KY make it into the SEC. One, whatever markets those schools bring to the table are already ON the table.
Two, the remaining top programs in those states already have other in-state programs in the conference, who will not want to share the conference prosperity with those programs, when they are also in heated rivalry battles with those programs every year.
I understand we have a "gentleman's agreement" with Florida, Georgia, and perhaps even Kentucky to vote together against those other programs joining.
I do agree with getting a program from NC and VA, if possible. NC State has always seemed to be the "red-headed stepchild" of Tobacco Road, and have felt disrespected by the ACC over the decades. Perhaps they may choose to leave. WVU has jumped all over the place, as has Virginia Tech, so neither program has longstanding historical rivalries with their current conference foes. They all bring virgin TV viewership regions to the SEC......