I've been watching the growth of 3D printers, and the incredible variety of ways they are used, and believe, when you add that to an economy where the number of jobs is (I think) on a permanent decline due to automation, that the world is going to be changing in really radical ways over the next 2-3 decades.
I see there being local shops, like Kinko's, where people can take their designs (which will be a huge market in itself, selling designs for other people to print). It will affect shipping and warehousing as well as manufacturing. It'll impact construction and even food packaging (as there are already 3D printed edibles.)
More service jobs will be done either by one remote person servicing several locations, or by a computer program. A live receptionist or concierge or admin. assistant will become something of a luxury-level perq. And we'll enter an age where we can't be defined by our jobs, where we can't expect that people will work full-time, and where that can't be an expected source of income.
I don't know what the result will be, and the interim as things shift is likely to be really rough, but things are definitely going to change radically.