Don't forget Hawaii too...I believe they were up there too and given that they are getting a new stadium, that could change the outlook for them. I don't think they would be added ultimately even if Larry Scott has a hard on for Asia.
I have been playing with conferences in NCAA FB 14. I basically re-did the Pac-12 and MWC.
I put CU in a I-25 conference with the likes of Wyoming, CSU, UNM, NMSU, UTEP, and TT while the I-15 conference had UNLV, UA, ASU, Utah State, BYU, Utah, and Nevada.
I think a lot of CU fans would like this conference set up.
UNM might be hurting for money right now but they really do fit the Pac-12 like a glove. The airport in Albuquerque is pretty much right next to the UNM athletic facilities which was a point that Plati made when he made his Pac-12 and Big 12 comparison. Just look at the C-USA and AAC and you will see how similar it might be to the Pac-12. So TT and Lubbock does fit that criteria and maybe TT will welcome the opportunity to be a niche Texas school.
Moving on to CSU. I'm steadfast in the belief that Colorado should have two P5 schools and that hasn't changed. The question is does CSU fit the Pac-12? I don't think they fit as well as UNM & TT at this point and it is because they might be a little too far away from Denver. Given that Larmier & Weld Counties have more than 500K residents which is more than the Lubbock metro area of 327K (according to Wikipedia) so CSU still does fit the Pac-12 in some way.
UNLV is already in the VHRU group:
https://en.wikipedia.org/wiki/List_of_research_universities_in_the_United_States
Nevada is VHRU too. So that prospective list should be Hawaii, Nevada, UNLV, CSU, UNM, and TT. Nevada will be under the gun to renovate their football stadium which still has a running track around the stadium and seats just 30K. A fast track expansion to 45-50K would need to happen with the track's removal.
Nevada & UNLV and UNM & TT should be the pairs so that means CSU probably goes to the Big 12 to take TT's spot. Hawaii & CSU would be the "9th member" of each division in a Pac-18.
West: Hawaii, WSU, UW, OSU, UO, Stanford, Cal, UCLA, and USC.
East: Utah, CSU, CU, TT, UNM, UA, ASU, UNLV, and Nevada.
Eight inter conference games for football. Games against the West can count as non-conference games.
Basketball would have 16 one way games and then round robin games with two selected rivals. CSU and perhaps Utah would be those two rivals.