What are the chances of Levin retiring?
Not germane to this discussion, but the perennially-putrid Detroit Alley Cats football team is the favorite NFL team in Michigan with only 50%. Except for Kalamazoo and Grand Rapids the state's biggest population areas are within 80 miles of Detroit. I am surprised that the Chicago Bears don't muscle in on the Grand Rapids-Kalamazoo TV market.
Kalamazoo's a bit of a different story, but a good share of Chicago fans in that part of the state live in the South Bend media market (Bears games every Sunday). There are a number of Chicago fans along the lakeshore as well, but they're likely not living in Michigan for most of the football season (a lot of these are summer homes).
By and large, Grand Rapids is solid Lions territory, and those TV stations can be reached almost to the Lansing area. My guess is that a large share of the GR market wouldn't be too happy about having to watch Bears games instead of Lions games.