Amazon drone delivery WILL happen. This will be completely disruptive to how stuff is consumed. Amazon being able to reach any point in an urban environment from its outskirts, at any time of day, within minutes and at a cost of just cents, will completely change consumption patterns (at least for existing Amazon users).
Once something has such a strong financial implication, any other obstacle in its way is going to crumble (not to mention that the technology is mature enough today to perform this; the barrier is regulation, and that can change with enough money at stake).
Once something has such a strong financial implication, any other obstacle in its way is going to crumble (not to mention that the technology is mature enough today to perform this; the barrier is regulation, and that can change with enough money at stake).