With the new playoff setup UO/UW/UU might be fine with sitting tight in a lesser conf that they think they can win. Even if it backfilled with MW teams, easier to be one of the top 6 rated conf champ. Maybe they will negotiate for the Pac Conf Champ to keep most of payday when making the CFP?
So far when presented the opportunity between improved chances to win a conference and cash, they have all taken the cash. Any of the schools get a Big 10 offer they are taking it. Not only for the money, but out of fear that Big 10 and SEC will pick off enough teams, get to a total of 48 and split off. The Big 10 doesn't need any of those schools, and the difference between a good pickup or a mediocre one in the grand scheme of per school revenue isn't going to make that big of a difference. A conference with Ohio State, Michigan, and Penn State is probably worth $80-100M per school. The rest are all in the margins. Sure they want to optimize, but there's nobody but ND left that is going to drive the revenue up by a meaningful amount across 18-24 teams at $80-100M per team as it is.
It's also a reason why Stanford certainly can be in play. UO, UU or UW are all worth more from a sports media perspective, but not enough that it has a real material impact on per team revenue. UCLA did not add value, but were added as a USC dance partner.