Air Traffic Control nightmare
These drones fly at treetop level, below air traffic control (unless you are really close to an airport).
Try making this video from a Cessna: http://vimeo.com/78370957
No, Gen-Av Nightmare, we need details how Gen-Av can co-exist with this.
I think this is a reality, not fantasy. With replaceable power packs these things could go all day long with a bevy of power packs being recharged. As Li-Ion power densities increase, so will the reduction in recharging and or range.