Maybe I missed a piece of news regarding Winter Cross Country, but so far no PAC-12 teams have posted any cross country schedules, and only 3 teams have posted indoor track schedules (Arizona, Arizona State, USC). None of those teams seem to put too much emphasis on cross country, so I would presume they would skip cross altogether. However, I would assume that Oregon, UCLA, Washington, Colorado, and the others would at least like to compete in something, so why aren't they?
TL;DR: Why aren't numerous elite programs competing right now?