Less than half of the B10 runs a spread.
Penn State, Illinois, Purdue, Northwestern, Indiana, Minnesota, all spread based. To go further, Ohio St, Iowa and Michigan all run a lot of spread formations and at times are most productive when they did so.
Wisconsin and MSU were pretty much the two teams that didn't run a version of the spread as their primary offense. That is why I do not buy the peso is dead arguement. Yes the passing atttacks are going to be lesser, but these teams all will show a lot of spread formations next year.