we're on the verge of a major breakthrough
I'm not sure why he said on the verge. The technology is here. He
just printed in titanium. And the prices are falling. There are now
sub $5k printers.
As far as the leap, it looks cool, but it doesn't work as well as a
Space Pilot Pro. My left hand moves the object just like I would in
traditional carving, i. e. brings it closer to my face, rotates it,
etc. My right hand does the 'carving', just with a mouse.