The B1G would, of course, want ND, but my reading of ND's hard-core board says they won't be interested for as long as they can. Even those on their board most devoted to going semi-pro express doubts that they would do that.
I think it would be for football, both basketball teams, and baseball/softball. These seem to be the sports of greatest interest to the SEC. Bama, for example, only has baseball, basketball, football, golf, swimming, tennis, and track as men's sports. It's hard to see them giving big bucks to participants in "the other 4". Kentucky and South Carolina have men's soccer tesh.ams, but play in other conferences because soccer is not a men's sport in the SEC.