It's not a question of drone deliveries coming in 5-10 years, it's already happening in some places: for example, DHL has a drone in service (albeit as a research project) shuttling urgent pharmacy orders to an island 10 km off the German coast.
The question for the next 5-10 years really if the economics and regulations can change or have changed to make it practical to do this on an ongoing basis for small and larger payloads.
http://www.theguardian.com/technology/2014/sep/25/german-dhl...
http://www.dhl.com/en/press/releases/releases_2014/group/dhl...
The question for the next 5-10 years really if the economics and regulations can change or have changed to make it practical to do this on an ongoing basis for small and larger payloads.