The 3D printing revolution implies a fusion of manufacturing and printing. This just underscores my point though: abstractions beget new abstractions. 3D printing is an entirely new category that is just starting to come into maturity and reach mass adoption. Who knows what the implications of that are? It could cause a boom in custom made, limited run products. It could help to end our reliance on China for mass production. It's not obvious to me it will lead to less jobs in manufacturing.