The article does a reasonable job of describing why our current innovations are less significant than previous ones such as the internal combustion engine and s

The article does a reasonable job of describing why our current innovations are less significant than previous ones such as the internal combustion engine and so forth, but is much weaker on predictions for the future. To cherry pick: The author claims, without any support, that "Three-D Printing is a niche activity-- fun, but unlikely to revolutionize manufacturing." The reality here is that 3-D printing, by supporting rapid prototyping, is already revolutionizing the development of products. See for example https://www.nsf.gov/about/history/nsf0050/manufacturing/rapid.htm https://www.nsf.gov/about/history/nsf0050/manufacturing/rapi...