Personally, intead of banning felt I would prefer legislation that all boots be disinfected after every use. It would be much cheaper than dealing with a broken neck and back.
Nice idea, but how do you enforce it?

If they ever ban it in PA, I'll limit my fishing to backwoods streams where I won't see another soul, and continue to wear my felt.

When I have to fish in more populous areas, I'll wear the rubber soled shoes, and tape big pieces of felt to my legs.