1) Why own cars at all? It's way more efficient to have a common pool of cars that you rent when you need them. I actually think that owning in general will eventually be replaced with loaning from shared pools. It's way better from planning, economy, ecology and maintenance perspectives.

2) Most of the breakthroughs were because of new levels of power or precision. Here we're facing a totally different kind problem, one of complexity. That's something we have no tools to deal with and no idea of even how those tools might look like. It's not like flight, or Internet, or artificial viruses.

3) Did you really just link me to a device from a sci-fi show? :-D The thing is that mass production can use optimizations, shortcuts and logistics that can never be used by custom production. Also, injection molding will always produce smoother shapes than 3D-printing, because the latter is discrete.

Also, ecologically speaking, it's better if people just own a set of mass-produced, high-quality goods than continuously print new stuff on their own. There's too much stuff in the world already.