It will be interesting to observe what this means for growth of cities. In the last 100 years, city sizes increased while staying within Marchetti's travel time budget [1] (1 hour for round trip) thanks to higher speeds available through motorized transport. Now that technology is redefining proximity once again, I wonder what factors will continue to encourage/discourage people to live in dense cities.

1 - http://www.cesaremarchetti.org/archive/scan/MARCHETTI-052.pd...