Mountain West commissioner Craig Thompson stated today, "We've informed them [Idaho and New Mexico State] that they will not be members of the Mountain West. Go onto Plan B, what ever Plan B may be."
Idaho and New Mexico State are the two WAC teams still without a home.
Given that both the Sun Belt and Conference USA have both said no as well, it appears that the only option for these guys if they want to remain in FBS is to go Independent. Less than an ideal situation for these guys.