I've seen a few of these and always thought it seemed an interesting idea. But I have a friend who figures out risks for an insurance company. For him, this idea seemed his worst nightmare. He thought there isn't any way these things will get insured, at least to anyone other than pilots.
Apparantly, they figure they have enough problems with people not paying attention and smashing their cars into various objects without them also falling out of the sky.
By the way, I just saw an accident about an hour ago.