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It does seem that the articles is written, reasonably enough, about just dropping a few driverless cars onto road systems akin to those we have today. Here's the thing thing though: If driverless cars were widespread, there wouldn't be any schoolchildren walking along busy roads; the schoolchildren would be chauffeured to school instead.*

If driverless cars can be made much safer than human drivers (tiredness, drunkenness, distraction) then these 'trolly problem' dilemmmas will be more niche cases. The choice won't between running over a young criminal and old doctor, but between keeping a transport system that kills tens of thousands a year and striving towards a system that could be much safer.

*Just an example. And anyone concerned with a lack of physical exercise for the children can consider the lovely outdoor playspaces that residential streets could become if they weren't merely used to store parked cars as they are today. I was once in a city during a transport workers strike - busses blocked offthe roads, and the children were all out on bikes and skateboards, and playing hopscotch-type games and football.

Obviously there would be transitional period with lots of challenges.