They will probably look to add more, but they have the minimum. PAC is still trying to find a school or two. PAC blew it. They had the schools for the strongest western league. All they needed to do was reverse merge with the MWC — 13 football teams. They could have then added Gonzaga for all other sports. They are flushing so much money down the drain.
I know most don't care about the MWC teams, but they are the teams I grew up with. I actually rooted for the conference during the Bowl Alliance and BCS days. And every once in a while you'd get an awesome WY, CSU or Air Force team (near the end TCU and uu were quite good). Basketball was always fun.
MWC: Air Force, Wyoming, UNM, UTEP (blast from the WAC past), UNLV, Nevada, San Jose and Hawaii (now official).
PAC: OSU, WSU, SDSU, Fresno, Boise State, CSU, USU. They still need one more. They've looked much further east to Memphis and/or Tulane (dumb). They could also bring up UTSA.