There's no way that the B1G passes on the prestige of America's top public university (Cal) or best D1-level private institution (Stanford). Remember, in the end, it's academia that renders these decisions. Those in charge want to be associated with Berkeley, not UCF, and Stanford, not BYU, let alone correspondence schools like Boise State.
My guess is that the B1G quickly takes Cal, Stanford, Oregon and Washington to get them off the board, even if all are required to buy-in to the conference, as we did for years. To further speculate, once it gets closer to the ACC grant-of-rights winding-down (or should it be, otherwise, broken), I expect that the B1G will target logical current ACC members, such as UVA, UNC. GT and newly-admitted AAU member, Miami.
In the end, the B1G's college sports "angle" is to control a sufficient percentage interest of AAU members as a priority, not an afterthought. The SEC will always play better football. But, the effort of the B1G's member institutions in combining academic integrity of collegiate institutions with athletic success will promote them to higher levels of achievement--across the board.