Many people though the discontinuance of the annual Nebraska-Oklahoma game led to Nebraska’s jump to the Big Ten.
Other rivalries that look to die are Oregon-OSU and Oklahoma-Oklahoma State.
Texas-Texas A&M looks like it will resume after Texas moves to the SEC.
UCLA-USC and Stanford-Cal were able to continue when both teams left for the same conference.
Now the Apple Cup between Washington and Washington State will continue for at least five years thanks to an agreement between those two schools. Wazoo still has to find a new conference home, though it seems likely some kind of deal with the Mountain West is coming.