I know the OP's suggestion is crazy, but should the ACC collapse towards the end of the decade, I swear the suggestion may make sense.
The end goal - 24 teams.
Have two networks - SEC Network South / SEC Network East
SEC adds FSU, Miami, Clemson, UNC, Duke, UVA, Uconn and Kansas.
As a result, the league has 11 teams who have won at least 1 FB national championship in the previous 30 years.
Men's BB has Kentucky, Uconn, UNC, Duke and Kansas in the same conference and seven schools that won a men's BB title in the previous 30 years. There would be must-watch BB matchups almost every night during the season.
WBB is bonkers, with six previous national champions in the conference.
Baseball is off-the-charts good, too - something like 10 previous national champions in the conference.
Perhaps the biggest driver is that ESPN would then own all those brands (almost all of whom are "University of" State or "State" State University - with appeal beyond just alumni and large potential subscriber bases).