My head is in Texas. I posted the data earlier to support that and have more below.
My heart is having a true western conference that dominates the Mountain and Pacific time zones.
How do we make that work?
Metropolitan Statistical Areas (national population ranks for Mountain & Pacific Time Zone areas in Top 100, 2015 census)
US Rank|Metro|Population|Growth 2010-15|Home Program(s)
#2|Los Angeles-Long Beach-Anaheim, CA|13.3 million|3.99%|UCLA, USC
#11|San Francisco-Oakland-Hayward, CA|4.7 million|7.40%|Cal, Stanford
#12|Phoenix-Mesa-Scottsdale, AZ|4.6 million|9.10%|Arizona State
#13|Riverside-San Bernardino-Ontario, CA|4.5 million|6.26%|UCLA, USC
#15|Seattle-Tacoma-Bellevue, WA|3.7 million|8.54%|Washington
#17|San Diego-Carlsbad, CA|3.3 million|6.60%|
San Diego State
#19|Denver-Aurora-Lakewood, CO|2.8 million|10.65%|Colorado
#22|Portland-Vancouver-Hillsboro, OR/WA|2.4 million|7.33%|Oregon, Oregon State
#27|Sacramento-Roseville-Arden-Arcade, CA|2.3 million|5.82%|Cal, Stanford
#29|Las Vegas-Henderson-Paradise, NV|2.1 million|8.38%|
UNLV
#35|San Jose-Sunnyvale-Santa Clara, CA|2.0 million|7.62%|Cal, Stanford
#48|Salt Lake City, UT|1.2 million|7.57%|Utah,
BYU
#53|Tucson, AZ|1.0 million|3.0%|Arizona
#56|Fresno, CA|975k|4.77%|
Fresno State
#60|Albuquerque, NM|907k|2.28%|
New Mexico
#61|Bakersfield, CA|881k|5.07%|
Fresno State
#66|Oxnard-Thousand Oaks-Ventura, CA|851k|3.31%|UCLA, USC
#77|Stockton-Lodi, CA|726k|5.95%|Cal, Stanford
#80|Colorado Springs, CA|698k|8.09%|Colorado,
Air Force
#81|Boise City, ID|677k|9.79%|
Boise State
#87|Ogden-Clearfield, UT|643k|7.65%|Utah,
BYU
#93|Provo-Orem, UT|586k|11.20%|Utah,
BYU
#100|Spokane-Spokane Valley, WA|548k|3.72%|Washington State
Based on this and how the Mountain-Pacific will continue to grow, I think a strong case can be made for a Pac-14 through the addition of San Diego State and UNLV. A secondary case can be made for New Mexico and Boise State if a Pac-16 becomes the plan. (Or even looking to BYU instead of Boise State if that became politically viable.)
You still have some Mountain-Pacific schools that will draw some eyeballs away. BYU, Fresno State, Nevada-Reno, Gonzaga in basketball, others like SJSU, Utah State, CSU & AFA. But not enough to make any more dent in the region than the rest of the country where G5 football conferences and D1 basketball conference challenge for much more of the local attention in their markets. In fact, these moves would absolutely cut the MWC off at the knees for media and recruiting bases while removing its only Top 100 media markets outside of the shares that Fresno State & San Jose State grab.
Is this do-able if they have a long path to equal media revenue shares? Possibly.
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Now the Texas stuff for reference (and why it's so damn desirable to expand there).
What's in the Central time zone that is west of the Mississippi?
Basically, we have 2 columns of states. Western one is ND-SD-NE-KS-OK-TX. Eastern one is MN-IA-MO-AR-LA. It's a stretch on the geography, but we could look to that western column of states for Pac-12 expansion. Here are the Metros in the Top 100 from those groups (plus Hawaii).
US Rank|Metro|Population|Growth 2010-15|Home Program(s)
#4|Dallas-Fort Worth-Arlington, TX|7.1 million|10.53%|TCU, SMU, Mix of TX & OU
#5|Houston-The Woodlands-Sugar Land, TX|6.7 million|12.44%|aTm, UH, Rice, Mix of TX
#25|San Antonio-New Braunfels, TX|2.4 million|11.27%|UT, UTSA, Mix of TX
#30|Kansas City, MO/KS|2.1 million|3.89%|KU, KSU, MU
#33|Austin-Round Rock, TX|2.0 million|16.58%|UT, Mix of TX
#41|Oklahoma City, OK|1.4 million|8.42%|OU, OSU
#54|Urban Honolulu, HI|999k|4.77%|Hawaii
#55|Tulsa, OK|981k|4.64%|OU, OSU
#59|Omaha-Council Bluffs, NE/IA|915k|5.77%|Nebraska
#67|McAllen-Edinburg-Mission, TX|842k|8.72%|Mix of Tex
#68|El Paso, TX|639k|4.33%|TTU, UTEP, NMSU, UNM
#86|Wichita, KS|645k|2.17%|KU, KSU, OSU, OU