In 2006, when I was chatting with the head of engineering at iRobot about this, he said: "this is what is going to make it work" and pulls out his car keys. Turning a system on will mean that the driver is making the choice. The same things were said about the first cruise control systems actually.

This is a dramatic over simplification. What will really matter is whether they work or not. From the performance I've seen, they will work.

It is also worth noting that the technology isn't in question, just the regulations. That means it is just a matter of when, not if.