I commented about UNLV on reddit and this was the response given.
UNLV isnt a good market. Las Vegas is an oddity in that the majority of the town are transplants that work and play in odd hours. Its also pretty bad academically, with no research being done, and has a small endowment. Nevada would probably get invited before UNLV too.
This was from a Washington State fan. He commented that Hawaii is probably the school that fits the most PAC12 standards. Also commented that New Mexico could get an invite, but it would probably be either Nevada or New Mexico. Said that PAC would never consider Boise, any more California schools or BYU.
Take it for what it is worth but usually fans of the conferences are more in the know than those that are not.