If Notre Dame is even a remote option, the Big Ten would be foolish to pass on them. They've always been "relevant" -- even if was in-name only. But 2012 showed that the Irish still have some fight left in them and aren't perennial hoaxes.
Notre Dame preserves the geography of the league and (like Nebraska) brings a large national following, regardless of the fact that Indiana is already "saturated" from the Hoosiers and Boilers. Like others have said, there are two types of schools; new television markets and traditional powers. There's even a third hybrid category, in which a school commands large national audiences AND brings a completely virgin TV market to the BTN. Since Delaney is damning geography and placing all his chips on revenue, he'd be smart to pursue the "hybrid" category -- hard.
For example, like Nebraska, both Oklahoma and Texas command huge national audiences. But the Sooners have a disadvantage because (again, like Nebraska), they come from a relatively small-population state. They have a national following, but Texas controls the massive mega-region of Eastern and Southern Texas. If the Big Ten came calling, Texas would generate move revenue simply because they'd increase both the national viewership and bring a new, massive television market. Oklahoma would only pad the national stats and bring a (relatively) smaller market of OKC-Norman-Stillwater.
Delaney needs to go after hybrids like Texas. Of course, I'm not suggesting Texas per se, but there are other schools like Florida State or Virginia Tech that would bring similar results.