I think outside the box when it comes to conference expansion. What if the B1G approached the 4 California schools - USC, UCLA, Stanford and Cal - and offered them membership to the B1G?
How the B1G benefits:
*4 highly ranked AAU universities added to the conference
*The State of California added for BTN and home ground for top recruiting in nearly every sport
*More balance between East and West divisions in terms of historic football powers (assuming the split is still East/West with 18 schools)
*Between the four schools, nearly every sport in the B1G sees increased competition
*The B1G becomes a true national conference - from sea to shining sea
How the California schools benefit:
*More than doubling their profits from sports. Not only would they reap the benefits of B1G money, but a future B1G contract with the CA schools would blow the roof off of the new B1G contract about to be signed
*Eastern exposure! The PAC 12 schools typically play many games late at night on east coast time. The California schools would enjoy more primetime East Coast games for more national exposure
*Strong academic tie ins to the CIC and fellow AAU members
*More historic powers on the schedule. Most of the historic powers in the PAC12 are the CA schools. They would not only continue to play each other for conference championships, but they would play Ohio State, Michigan, Penn State, Nebraska, Michigan State, Wisconsin, etc. for championships.