If you to Michigan or Notre Dame and don’t get into the business school, what’s the worst case scenario? That you major in economics and pick up some business classes on the side? That is probably equally good training as business school for many business careers. And probably won’t affect you in the slightest if you decide to pursue graduate studies like an MBA. And if you are looking to work in finance or anything quantitative then an econ degree is probably better training. On the other hand, if you want something specific like accounting or marketing then you had better make that your major.
I would also guess that the alumni networks from Michigan and Notre Dame are better than for any of the other schools you mentioned.