Completely agree with FF. I have no idea why badge is stuck on Nebraska being in the B1G. It's not traditional and it's not good for college football as a whole.
If you want "what's best for CFB" then Nebraska and OU need to be back in the same conference. I'm not saying it has to be with Texas in the B12 (or Midlands or whatever) but they need to be in the same conference. Playing every year as an OOC rivalry game works for some schools (UF/FSU, SoCar/Clemson, etc.) but Nebraska and Oklahoma belong together.
Similarly Texas and Texas A&M need to be in the same conference to work as rivals. Texas and Oklahoma, on the other hand, do not-- although I've certainly enjoyed the intensity of TX-OU as a conference rivalry.