On the margins of downtown, where the sidewalks are narrow enough, I've seen the sidewalk blocked by a fallen scooter, because pedestrians are only allotted a tiny strip of concrete between the roads and the parking lots. But you don't see people with physical disabilities trying to navigate those neighborhoods on the sidewalk anyway. Want to make those areas more accessible? Reclaim some space from cars. Provide an array of attractive alternatives that induce more people to get around without driving, and then you can have reasonably sized sidewalks.

Downtown, where pedestrians are more than an afterthought, I see people with physical disabilities using the sidewalks every day. (There's a homeless shelter not far away.) I don't see them having problems with scooters. There's plenty of space.

Honestly, I don't see many fallen scooters at all downtown. Considering how easily they fall over from being jostled (which should improve in future models) I suspect a lot of people care enough to take a second to put a fallen scooter upright. When you think about all the ways people can be shitty with scooters, you have to factor in that people can be pretty nice, too.

Of course people aren't always considerate. In my own neighborhood, sometimes people block the sidewalk with their cars when they don't pull forward far enough forward in their driveways, forcing people in wheelchairs to go into the street. That hasn't caused the world to end, and neither will scooters.