2 mile perch of red wings

The numbers of red winged black birds around the central Wisconsin marshes have been astonishing. To be honest I have never seen so many red wings. There is a lot of concern about major population declines in Illinois and Ontario Canada. The red wings populations count reports a 50% decline in some of these areas since 1972. I have mixed thoughts and concerns about the red wings. Are the Wisconsin marshes a last resort for the red wings or an ample habitat? I’d love to hear your thoughts and concerns from around your home area.