You want motivated consumers screaming for your products, and large segment of keeping the 2A in place is reminding consumers that "if you don't have access to guns, bad people will do bad things that could have been prevented".
https://news.ycombinator.com/item?id=21348242 https://news.ycombinator.com/item?id=21348730
This is not someone who is informed about the topic.
It had no effect.
The prohibition target the manufacture of such weapon for civilian market past 1984. As such, there is naturally a very high demand for a very low offer, and prices are astronomical, IIRC about $20k for a pre-1984 M-16 receiver. If you have the money to buy a such receiver and your state law do not prohibit you from owning the weapon, go ahead, fill the ATF paperwork, wait 6 months, and enjoy your full-auto M-16. With more paperwork, you can even shot it as a full-auto suppressed SBR. 100% legal.
It's illegal in America for private citizens to own automatic weapons manufactured after [some date - 1984?]. Since gun manufacturers thus can't sell them such weapons, they have no interest in making people want them.