I've heard talk about the Pioneer League (Drake, Butler and others) or the Missouri Valley(NDSU, UNI and others) for football. The Thommies will be playing a game in about a week-and-a-half at Allianz Field. The United have a home playoff game the next night. It'll be a good test on the turf.
For hockey, the WCHA part III, or whatever it'll be called. They could make being an independent work for a few years I guess. The arena issue is going to be a problem. I don't know how much room they have left of campus for an arena. Or how well it'll go over with the neighborhood.