In actual fact the driving (yes, shameless pun) motivation for this robot cab is money. They don't want to pay drivers.
The driving motivation behind any company is to make money, that's just how the world is, that is a political issue not a technological. There are lots of people involved in developing autonomous vehicles though, and everyone's motivation might not be as cynical. The reality is that getting people out of the driving equation will save lives. The need for transportation won't go away, and as long as it doesn't there will be a need for drivers. Besides reducing the traffic accident rate you get all the normal benefits you get from automation, lower transportation cost and lots of people get more time over to do other things. If that leads to improvement for "ordinary people" or not (whoever that is) is once again a political issue.
Every day I drive in traffic I see some situation and I think how will an auto deal with it.
People used to say a chess program would never beat a grand champion, turns out you could do it in 1996 with a disappointingly trivial algoritm as long as you had enough computing power. Since then the algorithms got better and we got even more computing power and a chess program that beats the world champion runs on an ordinary desktop computer today. To beat Go you needed neural nets, and today it's trivial (if you know how) to beat any human in perfect information games. Neural nets were developed in the 70's but it's not until now it's practically usable, there just wasn't enough computing power before. There have been an exponential growth in computing power that has made things that where impossible a couple of decades ago feasible. I think even software developers have trouble keeping up, exponential change is just too overwhelming and unintuitive.
Musk talk (tweet) a lot. He also says he is going to terraform Mars and transport people across continents using self landing rockets. Otoh, he now has self landing rockets, something many believed was impossible.
Err, only the grossly ill-informed believed it wasn't possible, because Space-X wasn't the first to do it. It was done decades before they did it.
BTW, the continent hopping rocket is as big of an impractical joke as Hyperloop is. Not everything Musk says is practical, some of it is demonstrably stupid.
Yup, but a lot of people were grossly ill-informed. And yes, completely agree about the continent hopping rockets.
But it's probably Musk's bold optimism that makes people like him, and that is an important part of what makes him successful.
My point was that Musk isn't exactly careful with the truth though, even if he does some cool stuff, so maybe take what he says with a pinch (bucket) of salt.