I traveled to the US in 2014 on a sponsored trip to research drones for agriculture. My report covered off on some of the technical challenges rather than the business side of it. You could see even in 2014 everyone had great ideas but profitable execution was going to be so hard. My report is here for a look back in time http://www.nuffieldinternational.org/rep_pdf/1438074605BenBo... . I then went on to start a business processing and providing satellite imagery in agriculture because I couldn't figure out a business model that would work for drones.