What the B1G should do:
Go to 18 teams and be done...for now. This conference realignment has proven that expansion is all about getting into big markets and gaining new cable subscriptions. The B1G has made it clear that they want a large presence in NYC and Baltimore/D.C. They also seem to want to go a little farther south.
1. So first they should take UVA. Them with Maryland is about the best they can do for the Baltimore/D.C. market.
2. Grab UConn to help supplement the NYC market (banking in on the 1 million in Fairfield County and the fact that Penn State, Rutgers, Notre Dame, & UConn are the 4 most followed teams in NYC)
3. That leaves the B1G's want to go farther south. The most talked about options are UNC and Georgia Tech. Let's look at both those options. Georgia Tech is basically like the N.C. State of Georgia in that it will always be overwhelmingly behind the main state school - UGA. The only people who care about Georgia Tech are students, staff, and alumni. The state of Georgia and Atlanta as a whole are UGA fans. Because of this, UNC is the next most logical get. Let's face it, North Carolina residents are either UNC or Duke fans. N.C. State is the red-headed stepchild that only alumni care about (much like Georgia Tech). Since UNC is the big prize of the B1G's southern expansion, you give them what they want - even if that means taking Duke. UVA, UNC, & Duke are a great package and would love to be in the same conference.
By adding UConn, UVA, UNC, and Duke, you are further taking control of the northeast (NYC), the mid-atlantic (Baltimore/D.C.), and the want to go south (basically gaining all of North Carolina minus the N.C. State alumni).
In addition to a great market expansion, which is what football is all about, the B1G instantly becomes the best men's basketball, women's basketball, men's soccer, and lax conference in the country. It is also academically superior to any other conference.
And all of this doesn't have to piss off the current B1G members' rivalries. Why? Because with 18 teams, you get 3 divisions of 6:
Western: Nebraska, Iowa, Minnesota, Wisconsin, Illinois, Northwestern
Central: Indiana, Purdue, Michigan, Michigan St, Ohio St, Penn St
Eastern: UConn, Rutgers, Maryland, Virginia, UNC, Duke
The orginal B1G doesn't get stuck in divisions with "watered down" football opponents.
3 conferences is doable with a conference playoff championship. There are 2 ways. Either the overall number one team gets a first round bye and the other two division champions play for a spot in the championship. Or you take the 3 division champions and add the fourth best team from whatever division its from (like the NFL wildcard).
This 18 team conference would thrive financially, academically, and athletically. And if Notre Dame ever decided to join, you could add them with Syracuse and take complete control of the NYC market. Done and done!