Whatever happens in the future of "unmanned" commercial aviation, rest assured, UPS will not lead the way. They will boldly follow, where others have ventured successfully.
Think of the logistics of unmanned flight into different countries and airspace. Then think of the ineptitude of this company to procure simple items.
Someday airliners may be unmanned. That's probably when UPS will be parking its MD-11 fleet and will be able to procure some high time B777s with lousy seats.