Not that stadium size matters all that much but it is a strong indicator of fan support.
Football stadium size.
TECH: 60,454
OSU: 55,509
Kansas: 50,250
Baylor: 45,140
TCU: 45,000
Houston: 40,000
Basketball arenas
Kansas: 16,300
TECH: 15,030
OSU: 13,611
Baylor: 10,347
TCU: 8,500
Houston: 7,100
Yes I will concede that geography matters, but it doesn't necessary correlate to fan support. TCU, SMU, RICE, for just a few schools who cant even fill their stadiums or arenas. This is why I hope the PAC12 would consider TECH, OSU & Kansas. These three schools have great fan support and are growing. Houston is a gamble, but I'm sure with P5 access they will rise to the occasion. If not Houston, BYU or Baylor would be great pick ups.
Also it does bring back a few old rivalries, not big ones but rivalries nonetheless.
OSU vs Colorado (Old BIG8)
KU vs Colorado (Old BIG8)
TECH vs Arizona (Border Conference)
TECH vs Arizona St (Border Conference)