@kfield: Would 3x the price be worth it to have pizza delivered by drone?
Where did you get the 3X price from? Home delivery is already pretty expensive as compared to picking the pizza up oneself -- we do it for the convenience. During rush hour it can take 40 mins or more for the pizza to arrive, and our house is only about 2 miles away from the local Dominos as the crow (hex-copter) flies. I don't see how the drioen woudl cost more than paying for a delivery person -- plus there's the added advantyage that you wouldn't feel obliged to give a 20% tip.
Thinking about a whole traffic jam of these copters flying around makes me think about the Bruce Willis movie The Fifth Element, where he was the a flying taxicab driver. Traffic management in 2 dimensions sounds like it would be a nightmare if the skies were crowded enough!