We just need to plan for a future with different sorts of jobs. The exact same thing was said about other labour-saving equipment that was introduced into industry in the past. Probably one of the first American examples was the Cotton Gin. That actually lead to an increase in employment (of slave labour).
As most of us on here are well aware, computers need to be programmed before they will do anything, and they have a tendency to break and require maintenance. More computers means more jobs for slashdotters doing these sorts of things. Also there will be more work on product design and development, as if you can get a computer to deliver the actual product, you can easily do a lot more variations on what you offer, and that will be how you differentiate from competitors.