Drones,what is next?

Drones are one of the greatest discoveries and fastest growing technologies of our century. Sales have been at a constant growth since the invention of the tech,not even speaking of the different uses for them. From hobbies to the military aspects,the tech seems to be limitless at this stage. Drones are being used by the police,media,nature reserves,mail deliveries,farming,historic restorations and even human transportation.The list is in the hundreds and the tech is still in its infant stages. So the the big question is.What is next in this great 21st century discovery?