Those kind of drones are not the kind of drone that can deliver a package, unless that package can survive a ballistic delivery to the ground.

Sure, by shaping the drone into a winged vehicle you can get the payload capacity up and make it move quickly as it goes from waypoint to waypoint on a "delivery route", even in windy conditions. But now you can't deliver the package itself neatly onto the ground adjacent to obstacles like you could with a quadra-copter.

If someone can figure out a reusable payload delivery parachute or something like that with the ability to keep itself on course even in windy conditions to hit a drop point on the ground from a couple hundred feet up, and make it work with packaged goods the size of a small book or video game, then it has a chance.