The noise isn't even the worst problem. What happens if a drone fails during flight (e.g., a bird flies into it) and it falls on someone's head? I don't really want aircraft, no matter how small, flying and landing around my neighborhood. (Nobody seems to think about failure modes when talking about flying cars either.)

I can imagine that after the first few widely-publicized accidents, the use of delivery drones in residential areas may be regulated out of existence.