so what? there are thousands of car accidents and deaths every year that doesnt stop majority from riding. What OP did is open my eyes on something I didnt think of before. Imagine a crowded city, like NY where 5 feet above your head there are hundreds of drones like bees flying everywhere and delivering goods: food, small mail, lighweight groceries, etc. That would be great win for problems with traffic in big cities. Mother Earth would appreciate that too. Awesome idea OP.
EDIT: you could also have personal delivery done this way, something like "electronic mail pigeon". You attach your lighweight package and you send it across the city. Of course we would need to minimum probability of accidents. Most likely software used would have to be governmet-approved/tested and you would have to have a license to be a part of "lightweight transportation channel" that flows above the city. But this is totally doable!
Excellent visualization. You've nailed the kind of socio-infrastructural change this shift could lead to.