I didn't see this show but would have liked to. This is just a guess but government regulation and other issues will likely push this out decades or further. They don't really have accommodation for how these drones will operate within the current air traffic system. I can see them being used as target practice in some places. If the news agencies have it correct shooting a drone is legal in some states. Additionally kids and dogs are likely to get too close damaging the drone and injuring themselves. Or our packages will be "drop shipped" until someone or something is hit. Oh, and do the drones fly in bad weather? I'm sure lots of less obvious issues are lurking under the surface as well.
I guess I'm a pessimist these days. It's a neat idea but I see a lot of competition from 3D printing and other ways for people to get what they want.