Build it. We have cars that fly. They are called airplanes. J. Random Citizen cannot just buy a plane and fly it. In the early days of aviation they could. But it quickly became clear that some form of training and licensing was required. If it is anything like your analogy, sure -- not everyone will be qualified. And they may put other people in danger. But we have laws to protect us from the most egregious idiocy and the regulatory framework, if needed, will be put in place quickly enough. (I say that and yet believe that we should have already instituted a "port 25" license, a "port 80" license, an "amateur internet operator license", and a "white hat security" license.)