Here's a Hokie's thoughts after hanging around for a year:
Might Want:
Texas -- I understand most everyone here hates all Texas schools, but given UT's fan base, academics and alumni donations I suspect the Pac would welcome the Longhorns with open arms if T's and C's can be worked out. From what I understand, The Longhorn Network was the big stumbling block back in 2010. (Side question, did you all hate Texas schools before 1996?)
Boise -- would have to hold my nose over academics (I'm used to it though, the ACC let Louisville join), but great fan support a national football name. <sarcasm>Plus the lucrative Boise TV market!</sarcasm>
Hawaii -- own whatever TV market there is on the islands, plus potential kick to recruiting ("son, stay four years and we guarantee a trip to Hawaii!"). Pac 12 travel expenses are already onerous though, so that could really hurt.
Kansas -- I doubt the Pac is interested in going further East, but KU is the total package from my perspective (academics, football, basketball) and you guys don't seem to hate them like other Big8/XII schools.
New Mexico -- better travel partner for CU, closer to a road trippable game. not seeing a lot of other compelling reaons
Nebraska - Omaha -- up and coming D1 school, gives all you Buffs a Nebraska on your annual schedule to hate
Also, I don't think most would want any more California schools. however, SDSU has a national name and reasonable fan support (if not the academics of the other Cali schools)
Wouldn't Want:
BYU -- the Pac seems to have a bias towards public schools
thumbsup
and to my knowledge has never had a religious based institution in it's membership. The Pac already has Utah, so BYU doesn't bring a new TV market. Decent academics and good research funding but no AAU membership (not that it seems to be a prereq). Besides, they wanted to go independent, let them stay independent.
Idaho -- they left once, screw 'em. doors closed.
Nevada -- not the most impressive academcis, but their technical program is on the upswing. No fan support.
UNVL -- no academics. no football support
CSU -- never mind Buff bias against little brother, it really wouldn't make sense from any POV I can think of.
AFA -- In some ways this would be great, but I don't see the Pac welcoming a service academy. It would be nice to have road trippable confernece game though