As much as people like to see ESPN and the SEC as the same thing, they have different interests. Is the SEC going to invite UVA, UNC, Miami, Duke, and GT, then possibly FSU, Clemson, NC State, and Wake Forrest at a full rate? Is ESPN going to pay a full rate for nine additional teams? ESPN has already told the SEC that they will not pay additional for nine conference games. If the ACC implodes, then UNC and UVA would get offers for full rates to both SEC and Big10. If both of those schools go to the SEC, then Miami, GT, and possibly Duke would get full rate offers from the Big10. Are those schools going to turn down a full offer from the Big10 for a reduced offer from the SEC? The other schools might get Big10 offers and might get SEC offers, but would likely have to negotiate more.
The SEC might want to keep the Big10 out of the Southeast, but they won't have the means to do so. I don't think it is part of the consideration for ESPN.