Here's an apologetically long and snarky alternative perspective...
I think it's an interesting thought experiment but Lucky for the car makers, you won't be sitting in a driverless car anytime soon.
I think this is a conversation being had at minimum 20 years before its time. For god sakes we're still using combustion engines in 99.9% of all vehicles. This reminds me of when I was in 5th grade and they were hyping up Moller Flying Cars(http://www.moller.com/
) ... Michael Jackson even pre-ordered one back in the early 90s.
The exponential growth of a processor is not the exponential growth of technology as a whole. See Peter Thiel... http://goo.gl/hpMmb
Technology requires commercial viability and adoption to be successful. Anyone remember Iridium? (http://en.wikipedia.org/wiki/Iridium_Communications
Let's assume that tomorrow the technology was available and licensed on all interstate highways...
Let's first look at consumer demand...
-Why do you think that there are classic car collectors paying millions for cars?
-Why do men spend thousands tricking out their car to make it louder and faster?
-Why is NASCAR and Auto Racing as a whole one of the world's most popular sports?
What an amazing future... We roll out of bed a robot dresses us, we are placed into our automatic car, driven to our office where we sit in a desk and our thoughts are wirelessly transmitted to the computer which dictates our very important ideas and we are fed an optimal amount of food daily at 12pm in the form of nano supplements.
Can't wait for this blessed future... http://movies.netflix.com/Movie/Idiocracy/70028899
Google, can you work on the Star Trek Transporter instead?