Big 10 isn't focused on the wrong things. College sports is almost immaterial to the bottom line of any of those schools. The research money dwarfs it as does tuition. I know people talk about college sports like it's "big business" and it is compared to when it was really an amateur sport, but it's small potatoes really.
In the last real season, 2019, the Big 10 lead in revenue (it did in 2020 as well).
B10 conference led the P5 in revenue in 2019 according to USA Today But that was just $781m. That's it. That's not a lot. Disney is #49 on the Fortune 500. ESPN is a piece of Disney, and they fund half of college football as a part of their expenditures.
College football will destroy itself, and the Big 10, like the Ivy League, will still mean something. They won't be losing any schools to the SEC. Bet bets to add, if they can make it work, is Kansas and Colorado.