Eventually it will all happen, if the human race last long enough.
Again if you were starting afresh, all the cars would be equipped with sensors, geo-located and 'talk' to each other as well as sharing data with a traffic control computer managing traffic flows and routing. Again we have a massive, uncontrolled, installed base that would take a decade or two to replace and has to share road space in the meantime. And by the time the big central computer gets off the ground there will be a load of incompatible earlier generation autonomous cars as well.
I'm just making this up so it's quite likely rubbish and not how Musk sees it.
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