I think digital-to-physical manufacturing is so much bigger than 3D printing. http://fabsie.com/blog/3d-printing-vs-3d-cutting/ and that CNC routing (3D cutting) is likely to find killer apps far faster than 3D printing is capable.
Even the difference of being able to play or rent a 3D cutter at work or through some service, or iterating something at home that you've made yourself, where the only real cost to it is your time spent having fun, is game changing.
But the average joe is unlikely to own a kiln either and unlikely to own any form of industrial pre+post-process. Disruptive manufacturing is my main interest as well as the new models of digital distribution. I believe the home will be an extremely limited means of production, but indeed a computer controlled plastic extruder (3D printer) will be an accessible technology many can own.