From Ammoland:

The first step is well underway. It is to educate the gun culture and the general public about the history and failure of the National Firearms Act. When people learn the history and the effects of the act, support for it evaporates.

When people understand the NFA is the result of a political compromise that did nothing to stop crime; but results in thousands of Americans being punished for peaceful acts, support for the NFA drops to politically irrelevant numbers. Support for the NFA is fairly wide, but very shallow, propped up by the dominant Media and their creation and proliferation of false narratives.