Here's my take on how Big10 and PAC10 conference expansion will play out.
Big10: Notre Dame finally accepts invite and joins the Big10. I think a lot of the postering going on is to reach acceptable conditions for ND fans and alumini so that they finally swallow the pill and join. If that can't be done, I think the Big10s second choice after ND is Rutgers. That's really bad news for an already weakened Big East. I think Missouri is a distant third choice even though the Tigers want desperately to join the Big10 and get a piece of the action (Big10 TV contract). I just think Rutgers market share in NJ is a lot more attractive than KC/St. Louis. Academically (which is very important to the Big10), I think either school would be acceptable. Boths schools have their academic strong points.
PAC10: Colorado is gone. If given the choice, the Buffs would choose the PAC10 over the Big12 and they are the PAC10's first choice. Utah will be the other school to be offered a PAC10 invitation. The Utes will accept on the condition that...
Big12: BYU gets offered an invitation to take Colorado's spot in the Big12.
MWC and WAC undergo some type of merger.
I also see the PAC10 and Big12 working together on a combined TV contract. Neither conference by itself has enough market share to get what the Big10 and SEC get from their TV contracts. Perhaps the PAC10 and Big12 negotiating toghether could get a better deal than either conference could get individually. That could also lead to additional bowl games between the two conferences and take some sting out of the Colorado for BYU swap which isn't an even trade from a market share and TV revenue standpoint even though BYU's major sports programs have been more competative than CU's have been the last few years.