The SEC isn't taking any more B12 teams.
The B10 isn't taking any B12 teams - although Kansas might wish it. And if they left, it's a hoops loss but a football win for the conference.
No one is leaving for the P12 unless they pull a huge rabbit out of their hat and somehow get a stunning TV deal. It would have to be A LOT better for someone to leave - and enough to keep USC/Oregon from leaving for greener pastures (and there are greener pastures).
No one is leaving for the ACC - though I could see WV there at some point. But again, the reason to go would have to be a much better deal for them, and the ACC TV deal doesn't end until 2036.
No one is going independent or to a G5 conference unless given no other choice.