If the PAC stands pat, with no marquee properties, then they will probably be looking at a reduced broadcast package during their 30-day negotiating period. We have no way of knowing what the numbers would be for a PAC-BIGXII merger, or cherry-picking, but they'd offer a better inventory of potential matchups and would put teams like Oregon in the Central time zone for Conference games. Content would be generated for late games that would be more interesting to a Nationwide audience than usual.
There is no telling what the math is for things like carriage fees or other items of value to the Media, as that is usually just guessed at, but such an arrangement would probably be to their liking. Since nothing happens without prior approval of the Media, then this is the crucial element of any deal.
I cannot help but think that the streamers (Amazon, YouTube, Fubo, etc.) have not been taken particularly seriously by all the parties. Their presence has been, to my mind at least, a foil against ESPN/CBS/FOX. Getting them to the table as a "Broadcast Partner" would be groundbreaking, in that a new element would be brought into the calculus of what used to be a fairly closed market.