Let's not forget guys and gals that these new regulations speak to the use of felt, I'm pretty sure nobodies saying you must buy new boots.
Many wading boots can be re-soled with new the rubber soles and/or studded rubber.

We fly fishers over the decades have used sole materials other than felt.
I wonder when they'll specifically outlaw outdoor carpeting , which has been used as sole material, with varying degrees of success.

Dave