Creating things out of thin air sounds absolutely crazy...
As far as 3d printing, I think the book Snow Crash had a 3d printer where you could select whatever you wanted and have it printed... Maybe it was a different Neal Stephenson book though.
Really fascinating stuff, I think housing will be the slowest to lower price wise, but everything else seems totally legit, I even saw they 3d printed most of a car.
Self driving cars reminds me of minority report everytime