Progression of Automobiles - From Horsepower to Processor Power to What?

Google's Self-Driving Car

Today on the Freakonomics, UCLA's Eric Morris has an interesting post titled "From Horse Power to Horsepower to Processing Power" which builds upon his 2007 article ACCESS, "From Horse Power to Horsepower." It's a good overview of the state of driverless cars from a social, legal, and ecomomic standpoint. Pull quote: 


Lest I get carried away, it’s important to remember a caveat from the horse manure story. While the auto did eliminate the problem of horse pollution, as we now know it sowed the seeds for vexing new environmental problems of which proponents at the time were blissfully ignorant. How might driverless cars make us be careful what we wished for?
In one way, driverless cars promise to cut fuel consumption and emissions, by coordinating car movements in a way that smooths traffic flow and improves aerodynamics through the “platooning” of the vehicles. However, by making car travel so much cheaper, faster and easier, driverless cars may harm the environment by promoting lots more driving. It is true that other technology is currently addressing this problem, with electrification (e.g., the Volt) and many other efficiency improvements like improved transmissions, materials, tires, and aerodynamics. Still, emissions and fuel use will remain a vexing problem that driverless cars could conceivably exacerbate.


It'll be interesting to see a similar overview in another 5 years. How much do you think wi