I'd say Texlahoma is "part of the South"
The Left Coast will probably have enough talent to keep USC afloat for a while. They "could" win it. But they are not very good right now, and don't have much promise on the immediate horizon.
Notre Dame still has a long way to go. They can make it to the playoffs by running the table as they have, but they will continue to get absolutely boat raced once they get there. Same with any other Northern team, for the most part. They still have the population up North, but they don't have that "win at all costs" mentality that makes the teams in the South so competitive. Instead they have "gentleman's agreements" and still have a willingness to work with the NCAA "self reporting" violations and whatnot.
The jury is still out on OSU, although they appear to be trending downward. They will probably stay on as a regional power, since they compete in a conference that has to live off of their table scraps. But the gap between them and the Bamas and Clemsons of the world just got a whole lot wider.
All of this is "imo" obviously.