Take North Carolina  for example:

B. WEAPONS OF MASS DESTRUCTION
North Carolina General Statute § 14-288.8 provides that it is unlawful for any person
to manufacture, assemble, possess, store, transport, sell, offer to sell, purchase, offer to
purchase, deliver, give to another, or acquire any weapon of mass death and destruction.
A weapon of mass death and destruction includes:
(1) bombs of all sorts;
(2) grenades;
(3) rockets having a propellant charge of more than 4 ounces;
(4) a missile having an explosive or incendiary charge of more than
one-quarter ounce;
(5) mine;
(6) any type of weapon (other than a shotgun or a shotgun shell of
a type particularly suitable for sporting purposes) which will
expel a projectile using an explosive or other propellant and
which has a barrel with a bore of more than one-half inch in
diameter;
(7) any firearm capable of fully automatic fire;
(8) any shotgun with a barrel length less than eighteen inches or an
overall length of less than twenty-six inches;
(9) a rifle with a barrel length of less than sixteen inches or an
overall length of less than twenty-six inches;
(10) any muffler or silencer for any firearm, whether or not such
firearm is included within this definition;
(11) any combination of parts either designed or intended for use in
converting a device into any weapon described above and from
which a weapon of mass death and destruction may readily be
assembled.


Now here is the exemption allowing NFA stamp owners to own these weapons:

(2) Importers, manufacturers, dealers, and collectors of firearms,
ammunition, or destructive devices validly licensed under the
laws of the United States or the
State of North Carolina, while lawfully engaged in activities authorized under
their licenses;

So if the NFA went away, then NOBODY in NC could own a silencer since there would be no licenses for them?

CRC

There are no licenses now, just tax stamps.

who said anything about nfa going away ?? its been on the books since 1934 at least thats what the $200 tax stamp says