If I'm the Big 10 I'd look to drop Northwestern and Rutgers and bring in teams from Texas and Florida.
I'd go Baylor and Florida St. or Miami. Baylor is right in the middle of Austin and Dallas - recruiting hotbed and centrally located between the biggest markets in state. Florida St/Miami speaks for itself.
Next on the chopping block would be Maryland and Purdue. For who? Notre Dame and Stanford? Maybe Oregon and Washington, or Clemson and North Carolina.
They could also rebrand to the Big20. Oregon, Washington, Baylor, Florida St and keep all the current. Or do the aforementioned and drop Northwestern / Rutgers and bring in Clemson / North Carolina. That would truly be a super conference from coast to coast with the branding, tv markets and recruiting hotbeds included.