Unless they changed the rules IIRC you can only get a medical hardship if you have a redshirt year available or if the first redshirt was used because of injury. Unless the U can come up with a medical condition from Trevor's redshirt year (and Joel Maturi is not a medical condition) then I do not think that he would get an extra year. The question is also whether or not he would use that year.
As a Badger fan who comes over here to talk recruiting/ recruiting info I just want to say that this sucks for him, the team, you guys, and me as I enjoyed watching him play.