Drones are good for extremely fast point-to-point and costs go way down if they're mass-produced. Far, far cheaper than human couriers.

Automated delivery vans are strong competitor but there's a lot more red tape involved with AI vans... drones might fill the gap until vans are on the road. By that point the cost of operating a drone might be so low that they still operate for expedite point-to-point shipping (think Amazon's Prime Now vs Prime Same-day shipping)