http://theconversation.com/driverless-cars-could-see-humankind-sprawl-ever-further-into-the-countryside-83028
Autonomous vehicles promise a future in which passengers are free to use their time productively (working, for example). And they can park themselves (or be part of a shared pool) which saves yet more time in the morning rush. Coupled with faster journey times, the incentives to live further out of town will increase significantly.