Agree on diminishing brands which is why I think there will be a big fight over UNC. They bring basically every the SEC/Big Ten could ask for in a program except they are NOT a blueblood or even near blueblood in football (UVA too but not to the same level as UNC).
You need your powerhouse football teams to play each other enough to keep TV schedules and home football schedules interesting, but not SO much where (to use your example) Ohio State is over exposed to every major power in the conference every year. As much fun as it would be to see Ohio State’s schedule fill up with Michigan, MSU, Pedo, USC, Nebraska, Wisconsin, Notre Dame, Oregon, Washington, and Miami each year, it would be bad for the conference overall and long term.
That’s why, I see more realignment coming. Schools will take a hit on the money to invite Stanford or UVA because you need those opponents that can fill up your wins column in football but also contribute with their markets/fan base size, basketball, non fb/bb athletic programs, and yes even academics (presidents would rather give up some money to be in a club with UVA than they would with Louisville or Boise St).
That being said, the demographics of the South are booming and the Midwest not so much. Getting the Big Ten into Virginia, North Carolina, and major Big Ten alumni cities like Atlanta and Miami would be a giant win for a Rust Belt conference. This is the next big realignment fight.
The SEC made it clear that they have no real interest in the PAC12 or any Big 12 leftovers as a standalone addition (I could see a school like Kansas or West Virginia get added to round out the numbers like they did with South Carolina and Mizzou in the previous rounds) so they will be focused on the ACC almost exclusively.
The Big Ten knows it can take any PAC12 school now and basically any time. If they lose out on UVA/UNC then they grab Oregon/Washington/Cal/Stanford and maybe even some 4 corner schools to build up their numbers, but their is no reason to do it now.
Wait and see how the ACC schools shake out then make a move.