The problem is that neither Oregon or Washington are all of the sudden going to want to stay in the conference just because UCLA stays and neither of them are going to be OK with reducing their payouts to keep them.
You'd basically have to go to the bottom feeders with no options like Oregon State and Washington State (ironically, CU isn't part of that), along with SDSU and say, "sorry, but we need part of your cut to keep UCLA happy" and have uneven rev share, but then you'd also probably have to give Oregon and Washington the same amount as well.
If UCLA staying brought total number per year to a very generous $450m (for the sake of argument), that works out to $37.5m/per school, at which point, you'd probably have to give UCLA, Oregon, and Washington $50m/each at the very least, but probably more, which leaves about $33.3m for the remaining 9 schools, and I think that's the most optimistic hypothetical. In all likelihood, it would probably take something like $60m/year for UCLA to stay, which would leave $30m for the rest of the programs and I don't think any of the other 9 (except for SDSU) would sign that and fall $30m/year behind 3 of their own conference members.