And it is gaining at least a bit of momentum.
A a history lesson from the inside, for those who might not have been there at the time:
When the modern SEC expansion happened, back in 1990 when Arkansas and South Carolina were added, which coincided with the addition of FSU to the ACC and the eventual follow on of UM, there were discussions about UM and the SEC.
it wasn't the Gators blocking the move, although that was a factor, as the animosity between Tad Foote and Marshall Criser vacillated between prickly and contentious.
It centered on three things:
First, culturally, the UM BOT felt that the SEC was not a fit. Vanderbilt was the only school in the SEC that the UM BOT felt had anything in common with Miami. In the words of my aunt, who was on the UM BOT at the time, "i'm trying to picture in my head tad (foote) sitting down for pecan pie and sweet tea with the folks from mississippi state and auburn." Miami was definitely seen as an outsider by a lot of the SEC schools, and not one that would go along with how things were done in the SEC.
Second, the alumni base was not in the deep south. The 'Canes community (at the time, and even today), is heavily coastal, northeastern, and metropolitan. The opinion was that having rivalries continue in places like New York, Pennsylvania, Boston, etc. was better marketing. It would also have endangered the rivalry with FSU due to scheduling commitments, and nobody wanted that.
Finally, and most importantly, there were financial and operational constraints. The board of UM, as we all know up until 5 months ago, has had a love/hate relationship with athletics. The requirement set by the SEC for UM to join the conference would have mandated the addition of a bunch of new men's and women's sports teams that UM was not prepared to either budget for, or operationally support. We would have been the smallest undergraduate population in the SEC, (along with Vandy), at it was impractical and financially suicidal to try to add that many sports teams to meet the minimums set by the SEC. We didn't have the student numbers, the facilities, the logistics, or the financial will to make all that happen. Even now, if i recall correctly, we sponsor the fewest varsity sports of any team in the ACC.
Put all that together, and the SEC was a non-starter in 1990, and has been that way since. At least until 24 hours ago.
And even now, I have my doubts, but the chances are no longer "less than zero."