From what they have shared with me 2nd, which is now 3rd hand to all of you. Nebraska has NO desire to go back to the BIG12. They are liking being in the BIG10. They (The AD and athletic program) did not like working with Texas. I know it may be hard to believe, but OSU and the other powers in that conference have been easier to work with.
I do not believe that Nebraska will ever go back to the BIG12.
Again, take it for what it is worth. But this is what has been shared with me.