I don't think the handover issue is a fundamental problem with the drones though. For example you could receive an automated phone call to let you know the package is hovering above your house. If you're ordering something to be delivered in 30 minutes you're probably going to be there to receive it.
But I still see theft in transit as an issue. The moral/mental threshold is surely much lower for shooting down a mechanical fly than it is for raiding a van.
If a police car is nearby it could be on the scene before the drone even hits the ground and having a few stories of parents getting a giant bill might do the trick.
That being said, some delivery people simply dump the package in front of my flat and shipment tracking says I (who wasn't home) signed for it. And of course the fun of living in a dorm with 120 people and the illegible signature (are there others?) and you don't know who it belongs to (because the slip of paper in your mailbox just says "delivered to neighbour").
Personally, I can see the appeal of the strategy "just don't have crime"; things are a lot more convenient that way.