GM was fooling with this idea years ago, like 20 or so, at that time though, it relied on sensors in the road to navigate the vehicle.
most of your crash avoidance systems only work over a specified mph, so, someone standing in front of a stationary vehicle trying to stop it's movement won't happen.
as a new car dealership tech, I see all the latest/greatest techno-foolery that is on GM cars, some of it is cool and a good idea [blind zone detection, rear back up camera/or sensor system are a couple that come to mind], but ya, some of it is borderline insane. have you seen a new car owners manual lately? you need a few college courses to figure out how to work everything.
at the same return, I bet 'back in the day' people thought turn signals and brake lights were foolish add ons, heck, we already have hand signals, who need blinking lights?
myself, I am still waiting on the flying car