Four factors will throw millions out of work.
I just saw the first "Macintosh like" robot at a trade show in Vegas. Baxter the robot sells for $22,000, and unlike robotic arms "like used at Tesla" that do long run production, this little robot can do short run production, be easily moved between work stations, and jobs requirements. So the jobs that the "ever more affordable" robotic arms don't displace, Baxter the robot will!
#2. 3D Printing
Within 10 years an ever growing array of products will be printed on 3D printers using plastics, metals, even DNA human parts will be produced. This will require one operator as apposed to the many layers of manufacturing required today. In addition, inventory of finished goods will no longer be required, eliminating a good percentage of our annual GDP.
#3. Voice recognition
Siri like voice recognition will only get better allowing more mundane secretarial and assistant jobs to be eliminated. When Siri and robotics are integrated, their function will multiply like Moore's Law.
#4. The driver-less Car
Google has shown that the driver-less car is effective, more efficient, safer than driving oneself. Two states so far have approved the use of driver-less cars. In the near future we will not need truck drivers, bus drivers, or cab drivers. I can see the day when you will not need to own a car, just request a car to your home, the nearest car will show up to drive you to your destination. You only pay for what you use.
These four technological marvels will transform our lives, but could destroy employment at an alarming rate.
The pressing issue in the 2020 presidential campaign will be, Don't tax the robots......