The only thing I question in the Pac-1o going from 10 to 16 is the unamious vote required.
Remember back when Stanford (I believe) voted against bringing in Texas in the mid 90s?
Things may have changed in regards towards Texas, but personally I don't think Stanford wants to be associated with Texas Tech, Baylor, Okie St and I don't know if they would approve the tag a longs to get Texas.
I have read that the wave of expansion is the way to go to get Texas and maybe A&M. For the Pac-10 expand the conference to Colorado and Utah if the Big Ten were to add one or three teams. Then you have 2 slots open and you can offer them to Texas and A&M without getting all of tag alongs.
What the Pac-10 doesn't want is Texas coming with with their tag alongs that would rubber stamp and decision with what Texas does to somewhat control the conference.
Nevertheless it should be an interesting next couple of days to see if anything shakes out.