Sadly, not very good. There was no reason for banning new full-autos in the first place, but they did it anyway. I heard not too long ago that there has only been 1 (yes ONE) murder committed with a legally owned full-auto weapon since 1934. What was the reasoning behind banning them in '86 anyway? Was there a rash of thefts of full-autos that wound up being used in crimes or something?
And what was the result of that legislation?
Criminals:
They'll keep doing just what they were doing before: Taking semi-autos (bought or stolen) and illegally converting them to full-auto.
Law-abiding citizens:
Skyrocketing costs and an ever-decreasing supply of older weapons. No new weapons at all. So much for that H&K G36 I wanted. Grrrrr.
On the bright side, the hi-cap and "Assault Weapon" bans might actually be allowed to sunset.
But I wouldn't hold my breath waiting for rollbacks on existing legislation. It'd be a political shot in the foot for most congressmen who proposed such legislation. Our best hope is the courts ruling them unconstitutional on 2nd Amendment grounds.