I see the downsides. But I also see the delivery vans in my neighborhood that are always double parking and blocking traffic. At least in the air, traffic can be routed in 3d.
1. Properly ticket and reprimand the people breaking traffic laws.
2. Properly reprimand the companies who contract out and run the vans.
3. Build cities that don't necessitate driving everywhere for everything.
4. Buy things in stores.