Your question should be applied to all laws and not just gun laws.
The United States has a limited amount of resources, and they don't seem to prioritize them.
So the answer should be yes to enforcing the current laws. If we find some of these laws no longer necessary, or not benefiting the people, then we should remove or alter them.
Criminal don't care about the law, that is why they are criminals. So the effectiveness of the law needs to be determined. The reason for doing that is again to insure that we have the necessary resources, and that the resources are being used efficiently.
To me that means that law enforcement needs to be focused on the most dangerous crimes threatening their community. I would rather have a non felony escape the law enforcement as opposed to a felony.
The prisons and jails are filled with criminals, overcrowded in many place, so like the fishing boats, we need to catch the big ones.