When the naysayers abound, you know things are about to get off the ground. Parcel delivery starting in NZ (http://www.nzherald.co.nz/business/news/article.cfm?c_id=3&o...). My bet is that this technology will most likely start small (see: unsexy) and incrementally improve the technology (battery, airframe, autonomy) and regulations, while Amazon and Wal-mart keep promising the moon.