The WCC has found a nice grove the past decade with Gonzaga being the major power and an NCAA presence virtually all the time. Schools like St. Marys the past few years have been able to step it up as well, and San Diego before them. With BYU in the mix, the WCC might be able to get 3 schools in every year due to the flexibility of OOC scheduling. Adding Seattle or Pacific might take one of those games off the plate.
On the other side though, adding Seattle or Pacific, etc, could force schools like St. Marys and Gonzaga at the top to have to replace a weaker OOC game with another strong one, which would be a benefit. For example, last year Gonzaga played Miss Valley St. which could have been Seattle or Pacific which are upgrades. This year Gonzaga plays Southern, CSU-Bakersfield, and Lewis & Clark St. Any new WCC school like Denver, Seattle or Pacific would be an upgrade.
so it's a push.
And if it's a push, it comes back to revenue: adding another school means splitting the pot another way. So until the media analysts show that adding Seattle TV sets will make more money, the WCC sees no need to expand with them.
Here's my main fundamental disagreement with "Seattle, Denver, Pacific don't get you anything."
First and foremost, from a competitive standpoint, we can throw RPI etc out the window. Your RPI is derived solely from how your conference does OOC.
The reason Gonzaga has to schedule the way they do (like Temple used to) is because the bottom of their conference is weak and doesn't win games. Adding BYU is going to help your RPI as a whole because they bring an average of 10-3 OOC record into WCC play every year.
Pacific is 10-8 vs the WCC in OOC games the last few years. If they join the WCC, they replace those games vs Big West opponents, they are going to bring in a similar OOC record to the WCC SOS every year. Pacific scheduled 14 OOC games last season, and only ONE was a conference below them (Big Sky). Replace their 5-4 vs WCC/WAC teams with 6-2 against BWC teams (against whom they are .750 against) and they are going to bring a 10-4 OOC record into the WCC.
Pacific, BYU, Denver and Seattle, you are basically replacing one game on your schedule vs an RPI killer, with one game against a better team.