Repeal of NFA ‘34 in its entirety isn’t viable in the near future. Not via courts and not via legislation.
But many parts of NFA ‘34 probably are vulnerable. Short barreled rifles and shotguns would seem to be at the top of the list with suppressors not too far behind.
In the next legislative session we should attempt to repeal some of these nonsensical restrictions. It may not be as cool as getting access to new full autos but it is probably a weak spot in the anti-gun defenses. And anytime you can cause the opposition to spend resources defending a losing battle you should give serious consideration to engaging them on that front. It also somewhat reduces the power of the ATF.
Even if it costs us twice as much (in dollars and political capital) as it does them they have far less than one half as much to spend. Every backward step they are forced to make brings them one step closer to the cliff of oblivion.