I am a deer hunter. Not a fan of doing away with the shotgun zone. But it is what it is.
My concern is unethical people who might see a dog and not see the hunter and take a shot at the dog. Sounds awful, but we all know there are people with low ethics and/or immaturity.
Obviously, there is a greater risk of stray bullets too, but I'm less concerned about that.
Around sunset is a different matter. I always wear a lot of orange when bird hunting (and it is required during deer season). Some don't and stick to just the hat. Might be worth considering wearing more for those who normally don't. To be clear, I am talking about a greater risk of someone seeing movement far away and not seeing the orange and taking a shot. Some people have better eyesight than others.
If they ever change the starting time for birds to be closer to sunrise, that would be another thing to watch out for.
I view all the risks above as very low. But they aren't zero.