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They weigh 80-85lbs and travel at speeds of around 50mph.

The impact would be quite serious, if they crash at speed but even falling on a car or a human would be quite serious, possibly deadly, even if the propellers don't spin.

Also drone and payload falling to the ground from any kind of height could cause serious injury or death if it falls on someone.

Which is the argument against flying cars. Uncontrolled flying car crashes over populated areas could be catastrophic.

Easy, don't walk near buildings then! /s

I expect some kind of automatic drone parachute system to develop.

I think parachutes take more height to work properly, compared to building heights.

Maybe if they fly at much higher altitudes for most of the flight.