While I am a devout believe in; "If it can go wrong, it will," there are certainly safeguards that could be implemented to decrease the opportunity for Darwinian selection. Weight on wheels switch could automatically decouple the propellors and put them in beta or feathered status to slow them to a stop. Modern LED lights (both visual and IR) can be inserted into the propellors to make it abundantly clear where not to go. All of this said, I remain concerned about the military utility due to the hazard. People who have not slept in days and are wanting to get away from other people trying to kill them tend not to be on the same level of rational thought as those of us who sit in air-conditioned safe spaces sipping our favorite caffeinated beverage.
As I said earlier, I do think the technology, as being built, can be used for civil purposes more readily. Certainly, civil Emergency Medical Evacuation will need some consideration as those can be chaotic environments as well, but VIP and deep-sea oil rig transport where you can control the movement of people are certainly viable in my opinion.