Particularly with the 3 you mentioned, yes. They may have to bundle their rights (with ND?) to protect their media partners from a bad year, but they can still schedule independently.

The key with those (at least with USC and Texas) is that they are home to good recruiting, and could easily schedule the teams from the conferences they're leaving. When BYU went independent, and if Boise did, they'll've had a difficult time scheduling former MW foes.