Real question for me is: "Why would ESPN want to start paying four times the price for the same inventory of Florida State home games?"
Right now, as part of the ESPN ACC contract, ESPN ultimately pays Florida State about $15-$20 million a year for the rights to all of their home football, baseball, basketball, volleyball, softball, and soccer games. Why would they pony up another $50-$70 million a year for those same rights under an SEC contract?
Same question could said for Clemson, Miami, North Carolina, Virginia, or anybody else that currently being considered a 'net add' for SEC membership. OU and Texas were different because the Big 12 had multiple media partners, so getting more Texas and OU games on the ABC/ESPN family of networks brought some tangible value to the table. Since ESPN owns all of the rights to the ACC for the foreseeable future, I'm not sure they're going to be as willing to let them out of their grant of rights for some lowball $10 Million a year number.