Driverless Mercedes E-Class sedan set for sale in March 2016

I understand the logic behind shutting off the system if the driver takes their hands off the wheel, so as to put the responsibility and fault on the driver.

But what about fallbacks for the driver's error? When I think about the dangers of allowing living beings to drive two ton death machines, I think about: brain aneurysms, drunk drivers, and falling asleep at the wheel.

I guess we're still a few years away from consumer self-driving systems.