I can see Hawaii as a Pac pick 10-20 years out. It would be a natural bridge to Asia and Scott has said he wants to make the Pac brand big out there.
As for UNM, I think they're a second-level candidate for the Pac or Big 12 beginning sometime in the 2020s. Albuquerque is only going to continue to grow and they would be another piece to glue the Four Corners schools together.
If it's not all about money and TVs, and conferences HAVE to go to 16 (I think the Pac should stay at 12 for at least 20 years), then I'd add Hawaii, UNM, UNLV and either UNR or CSU.