To be fair, the change only extends to individuals holding a CCW permit in their given state. Why do you care, anyway? If you don't carry, then don't. Although, with Washington being an "open carry" state, I wonder if that is affected.
The whole additional poaching thing is BS; poachers bent on breaking the law aren't going to comply with the law anyway. Not to mention that these guys don't poach with handguns. Additionally, the "increased violence" complaint is a canard.
1. A state carry permit has no bearing or force on federal land. A person without a Washington carry permit can carry a gun in a Washington National Park if this chnage is enacted.
2. Washington is most certainly not an open carry state. It is concealed carry only and enforcement of this provision is very strict.