I think these additions are good for Miami in the long run and here's why: the ACC is planning for the exit of at least the big 3 (Miami, FSU, Clemson).
Why would the ACC randomly add three teams? Because they know three teams are gone. While school presidents usually aren't that impressive, Jim Phillips knows what he's doing and he knows what's going on. He knows that FSU and Clemson are gone, he knows that we want out as well... But how does the inevitable happen without the complete collapse of the entire conference? You add more schools that you have zero worry about leaving.
The ACC just wants to still be a conference in 2026. This is their way to do it. I would not be surprised if there were some backroom deals with ESPN, telling the ACC. Get late night window games, that could potentially have good matchups, get into San Francisco. Get into Dallas, and keep UNC versus Duke for basketball, then ESPN will continue to pay the current rate for the current deal even without the big boys. It is still a great deal for them for over 10 years, the only negative is they still have to staff and pay for the ACC network. As long as the North Carolina schools stay together, there will still be a conference and it will still have eyeballs, at least for basketball. What the ACC does not want to happen is for everyone to leave putting them all out of jobs, and ESPN doesn't want that to happen because then they have to pay new money to now. Bigger conferences in the SEC and Big 12, and they potentially lose more to Fox/NBC if the Big 10 poaches.
I think this is part of a deal to let FSU in Clemson go to the SEC, keeping them in the ESPN universe, then let Miami go to the Big ten. Will there be a partner in Georgia tech? Maybe. I think this says North Carolina isn't leaving and they rallied the troops for a deal to keep the conference.
Just a theory.