I think it will be big, but I don't think it's bigger than the automation of manufacturing that began during the Industrial Revolution.

Think about the physical objects in the room you're in right now. How many of them were made from start to finish by human hands? Maybe your grandmother knitted the woollen jersey you're wearing -- made from wool shorn using electric shears. Maybe a clay bowl your kid made in a pottery class on the mantelpiece. Anything else?