OK as the first UCD representative on this thread, please allow me to clear up a few things. First of all, UCD is NOT joining the Big Sky in football or anything else. UCD will become a full member of the BW in 2007 and is currently playing full BW schedules. The football team is in the Great West Football Conference. Northern Colorado is joining the BSC next year, which leaves the GWFC one team short of qualifying for an auto-bid for the I-AA playoffs. Both Dakotas are actively searching for an all-sports conference so it is pretty much understood that the GWFC isn't going to last long and UCD will be back as an independent.
The new stadium on campus is scheduled to open up in Sept. '06. It will have 10-12K seats with grass endzone seating for 4-6K for a total capacity of 14-18K. It will be expandable to 30K. Schools don't build 30K seat stadiums to play I-AA football. Ask anyone on the coaching staff or in the athletic department and they'll tell you UCD will be I-A in either 5, 10 or 15 years. As someone else said, D2 and DI-AA football just doesn't really work in California as so many schools dropped it. UCD is the biggest school in I-AA now.
I don't see UCD ever joining the WAC unless it wanted a football-only affiliate. The BW makes infinitely more sense for every other sport at UCD for any number of reasons. Football does not make decisions for the athletic department as a whole.
I can't fathom why so many are so eager to add Sac and Portland to the WAC. Both large commuter campuses with lousy facilities and fan support. Just because a school is in a large metro area does not mean they'll get huge crowds and big TV $, just ask SJSU. The Big Sky would LOVE for you to take those two schools off their hands so they could add the Dakota schools. Maybe Cal State LA is available too.
It seems inevitable that the UCD football program ends up as an independent, in either I-AA or I-A. It sucks, but there's no other logical options forseeable right now. I don't see any reason the Pac-10 would ever expand and the MWC brings the same problems as the wac: much higher travel costs, no traditional rivals, steps up in some sports and down in others. So we'll see