It's an interesting question. I agree it makes sense in CT but the politics behind it will probably be impossible to overcome. There are noise reducing shotgun barrels legal for use in CT right now. The original one was called a "metrobarrel", they are stupid long (like 60") but they cut the noise down to a fraction of a regular barrel. Other manufacturers have tinkered with the concept, the shortest one I've seen was about 40". Not really silencers because they don't have a can. Also, as with traditional silencers you need to use sub-sonic ammo to realize the most sound reduction.
Also the metro barrel requires you to use special ammo low noise/recoil for you to have the noise reduction. Federal was making it way back, when they first started making the barrels. So for example if you just used standard Remington steel shot you would not see much of a decrease in noise. Additionally the cost of this special ammo is greater than all the other non-toxic ammo out there. So as far as waterfowling goes most would be unwilling to use it. Now for suppressors for say deer hunting I am sure most of the hunting community would support it, it would get scrutinized by the bunny huggers as they wouldn't be able to complain about noise.