I wonder the same thing about autonomous trucks.

There's likely to be a significant period between the first driver-less trucks transporting goods across unpopulated areas and the vehicles being competent enough to detect the fact that someone is unloading the vehicle and that that car sitting in front of you is not traffic, but is just there to make you stop while you are pilfered.

The move from a crime involving people to one only involving property may well lower the bar to would be criminals.