Well, I agree that 3D printing is going to be a big step forward for the type of people who own CNC machines and own wood or metal shops.
But I think that's a pretty small group, and I don't it's big enough to justify all the overblown talk of 3D printing revolutionizing the world in general.
Depends if you talk about the present or about one or two decades ahead. Some day, probably less than 20 years from now, most people will have a practical desktop factory that will make lots of useful things for them.
Current 3D printers are not revolutionizing the world yet, but the next desktop factories will.
But I think that's a pretty small group, and I don't it's big enough to justify all the overblown talk of 3D printing revolutionizing the world in general.