Peak, I was actually involved in a UAV start up a few years ago as the CTO and R&D Director. The tech out there is absolutely amazing! Sadly, I didn't get to watch the video you linked to(at work currently), but I can tell you, if you happen to have a love of all things technical, drones are absolutely fascinating! Not sure about the ability to deliver products and such, as our battery tech would have to evolve quite a bit to accomplish a pizza, or 6 pack of brews. And not to mention dropping something from a few hundred feet up onto someones head! Ouch! The uav I came up with was huge, and not a quad. Said another way, HEAVY! I knew then that quads were the way of the future, but couldn't really get the powers to be to listen. Oh well.
If you ARE into quads, you should look into quad racing. It's incredible, to say the least!