"As we've discussed, gasoline prices are just part of the story. The lack of growth in miles driven over the last 5+ years is probably also due to the lingering effects of the great recession (high unemployment rate and lack of wage growth), the aging of the overall population (over 55 drivers drive fewer miles) and changing driving habits of young drivers."
http://www.fhwa.dot.gov/policyinformation/nhts.cfm
Why Young People Are Driving Less and What It Means for Transportation Policy http://www.uspirg.org/reports/usp/transportation-and-new-gen...
Data has shown that between 55+ retiring and younger potential drivers preferring not to drive, vehicle sales have plateaued. If self-driving cars take off in the next ~5 years, that'll be the death of a large part of the auto industry.
End result - car sales stagnate.
The issue is there are still inelastic demand services that need their costs driven down drastically: Education and healthcare. I'd also suggest petroleum being displaced for transportation as well. Reducing the cost of these services reduces the amount of work needed to consume said services.
I argue an 11-15 hour work week is still possible as technology and innovation continue to move forward.