Just like how provate pilots are instructed to stay above 500ft around urban areas, somethine similar will need to be established for drone fly-zones. The FAA's "preferred" guidelines pdf @ source has highlighted most of the problems associated with commercial drones already:
"a. Select an operating site that is of sufficient distance from populated areas. The selected site should be away from noise sensitive areas such as parks, schools, hospitals, churches, etc.
b. Do not operate model aircraft in the presence of spectators until the aircraft is successfully flight tested and proven airworthy.
c. Do not fly model aircraft higher than 400 feet above the surface.
When flying aircraft within 3 miles of an airport, notify the airport operator, or when an air traffic facility is located at the airport, notify the control tower, or flight service station.
d. Give right of way to, and avoid flying in the proximity of, full-scale aircraft. Use observers to help if possible.
e. Do not hesitate to ask for assistance from any airport traffic control station concerning compliance with these standards."
air traffic controllers might not be too happy about having more crap thrown at them, but it would be averted if the delivery stations were zoned up properly around controlled airspace. I'd be more afraid of neighbors flying a drone into my garage to "borrow" my tools.
CYPHER?! WHERE'S MY KINDLE?!