They have been banned in the CBD of my city because they are ridden on footwaths plenty and after numerous collision injuries someone was killed by an electric scooter. They are need to be regulated, licenced and only ridden on the road/cycle paths if they go that fast (whilst also being practically silent mind you).

I get annoyed by them all the time because people rip them around in places you wouldn't take a car, and they're getting powerful enough to be dangerous. Still, the potential is huge. They use so much less space, infrastructure, and energy than cars. They're also significantly cheaper.