The whole notion is dumb. It's hit the peak now, it's downhill from here. [...]
Then you get people comparing home 3D printing to word processing, as if they still don't get that you can't compare information processing to handling matter. It's not the same, and never will be.
I kindly disagree. Today's machines indeed are only really useful for a limited audience, but once the complexity of use - both in software and hardware - decreases sufficiently their usefulness will expand to fields not even thought of today. I am looking forward to using the 3D equivalent of facsimiles of historical material in history classes. Just consider the possibilities: Instead of showing a picture of a Stone Age arrowhead or a Pope's seal - or, looking at other subjects, molecules, DNA, bacteria, organs... - I could pass around a life-size replica. Not just one taken from the limited collection my school has seen fit to purchase, but one chosen specifically to fit into my topic.
Similarly we are currently evaluating different 3D printing options for the volunteer emergency service I am a member of for producing scaled models of damaged buildings, vehicle wrecks etc. for strategic training. It would open up scenarios currently infeasable to simulate with our hand-built models.
It still is a long way off. But so were ubiquous cheap colour print-outs just 20 years ago.