It's already worse than that.  Robots have been used to chase the homeless away from businesses in American cities already.  They kill people everyday in military engagements.  TIKAD is now offering entire armies of weaponized drones to governments (or presumably anyone with enough money to buy them), and the USA, Russia, China, and Israel are mentioned as 'early adopters', in their sales literature.

So, the massive push to disarm people presently in America seems quite sinister.  Fortunately, however, there are better weapons than guns against robots.  A couple months ago a swarm of drones was used to attack a Russian force in Syria, and the attack was unsuccessful.  Most of the bots weren't shot.  Most of the bots were hacked.

We need apps on our phones to disable bots, and we can hold them off for a while yet.  Guns are made to hurt things made of meat.  Our bullets can be saved for our real enemies, rather than to oppose their weapons.