I heard a speech from a local technology entrepreneur, and he emphasized points raised by Ray Kurzweil. Specifically, that technology advances at an exponential rate. For instance, the printing press took 100 years to be adopted, it took 50 years to adapt the telephone, it took 8 years to adapt the cell phone. The same principal applies across many areas of technology from Moore's Law to disk capacity, and even in biological research, like genome decoding and brain scan resolution, and even to evolution. Here is a speech from 2005, near the time of publication of his book "The Singularity is near".