Honestly, it's about as far away as you or I want it to be. There's nothing stopping a group of motivated people from building a drone assembling factory that

Honestly, it's about as far away as you or I want it to be. There's nothing stopping a group of motivated people from building a drone assembling factory that fits in a cargo container. There may come a time where we have to stop outdoor festivals and parades because of people like that Las Vegas shooter from a couple years ago. The real concern is when people can build a factory that can build the factory...