Progress is slower in the world of atoms than in the world of information. I watched the progress from the first DARPA Grand Challenge for self-driving cars (2004, no car made it to the finish line) to the Urban Challenge in 2007 (many cars succeeded in a much more complicated environment) and thought that self driving vehicles would soon be commercialized. But there are 10,000 "last 1%" cases left to handle and we still don't have good enough systems to replace truck drivers or cab drivers today. Replacing jobs like plumber or electrician looks even harder than self driving vehicles because it requires far more intricate physical manipulation and perception than driving on public roads.