Why are you so quick to claim it's a "less-than-carefully thought out [idea]"? If I recall correctly, Bezos even joked about how they need to make sure it doesn't land on people's heads. There was also mention of the forthcoming FAA rabbit hole to step into. They're not idiots, so give a but more credit where it is due. He fully acknowledges the technology is years away, but gives us a taste of what's potentially coming.
Otoh, it is interesting to see that everybody is OK with Amazon drones taking aerial pictures of their yards.