Lots of places are not even bicycle safe and walkable. So I don't even see how Electric scooter will work in those locations. I notice it's adopted in places where people can walk and bike.
It's become somewhat popular in the US, despite the US having no cities with good bike infrastructure. Convenience is a hell of a drug.
The way I see it, this increased uptake could help drive greater investment in bike lanes and walkability. Politically, it's always easier to spend money on things people already do than on things they might do if you spent enough.
Ideally, we'd have carless urban centers, with only buses, light rail, and small vehicles (bikes and scooters) allowed in a certain radius. This would allow greater density in the downtown area, eliminate most pollution, and promote general health, yet for some reason, nobody seems to propose it. It could even be coupled with free mass transportation in that region, since costs for running such a service would likely decrease (could probably even have it driverless since there aren't as many hazards).
The toughest nut to crack would be replacing trucks, which could probably be handled with either light rail handling goods or truck-only roads completely segregated from the rest of the roads (say, tunnel or overpass).
Drop the speed limit down to 15 mph on all side streets, and some main streets. Leave a few arterial streets here and there.
Delivery trucks can still share the space, not huge semis but smaller ones are no problem, they are infrequent enough making deliveries to businesses that they shouldn't be a huge burden (see: How the rest of the world handles it).
Keep semis on the main streets of course.
For larger arterial streets, separate traffic by size. Honestly fences are cheap and used in other countries, I am not sure why American cities insist on just thin painted white lines. It is not like a fence takes up significantly more space. :/ (Maybe 2 inches extra width, if that?)
The Burnham plan for Chicago had the city designed with a double-decker road grid. Trucks would use the lower grid. There are some underground streets still though at this point there isn't any kind of segregation of traffic (if anything the underground roads are more for moving cars quickly past the city
