This article misses the point completely. Fundamentally the question is, if some technology has made us twice as productive, why don't we work half as much? This will never happen because capitalism and economics are completely psychological. You could look at any period of history and see some invention that caused a 2x increase in productivity. Inventions like farminng, the electric or gas powered motor, etc. Humans will always fill the void left by their extra productivity with more work.

We have the technology _today_ for the average work week to be about 5 hours we just choose not to do this as a society.