For realsies....
SEC is the only conference without an exit clause. If the B1G is going to move a team the easiest would be from the SEC.
Missouri doesn't seem all that happy and just 5 short years ago was begging to be let into the B1G.
As long as cable contracts are set up as so, Rutgers is safe. A decade from now with the 50+ million a year, if they can't improve their lot (and I'm not talking football here, even though that is the most visible,) then maybe a discussion can be had about a replacement.