The SEC and Big Ten do not want Notre Dame to join the ACC, they want them to come to their league. ND joining the ACC keeps the ACC alive and kicking a little longer. Those two want the ACC to fall apart so they can pick up teams like ND, FSU, Clemson, and Miami and then see if there's value in teams like Louisville, UNC, etc. They'll do all they can to prevent ND from joining the ACC, but when that ACC agreement is gone then they'll push ND to join a conference so that those 2 leagues are the only game in town, which will increase their value.
The SEC and Big Ten's ultimate goal is to destroy the value of the ACC, Big 12, and G5 as much as they can and then they become their own league and become the #2 officially in revenue competing with the MLB, NBA, etc. Because as of today, CFB has a lot of value but it's spread out. The SEC and Big Ten expansion has pushed it closer, but they basically want to become like the pros where their games are the only ones that matter. There's still some value to ACC, Big 12, etc. games and even a Boise/UNLV game. Their goal is to basically make anything not those 2 leagues a minor league and strip all the value.
