It's arguable whether having five million flyers is a safe thing
It's not even arguable - it's absolutely not a safe thing. The street I used to live on was littered with bits of cars that fell off, and then the owner didn't even bother going back to get. Hub caps, mirrors, door handles, mufflers, once a whole rear fender. Basic maintenance, or even "taking care not to run into things" is an alien concept to a lot of drivers, most of whom will be the first one to get angry and confrontational if you suggest that maybe they need to take better care of things.
And the Flying Car advocates want these people flying over top of my house?
No thank you. There's enough things to worry about dying from than some idiot's fender falling on me while I'm walking down the street.