You have specialized trucks that sell ice cream because the cost of traveling to an ice cream seller is high compared to the benefit gained from the ice cream, often so high that it wouldn’t be worth it at all unless you happen to be a block away from it, not to mention that ice cream is often sold to children who have limited ability to independently travel to a store. And even then, they haven’t driven ice cream parlors out of business, and the ice cream you’ll get there is probably going to be better than the ice cream you can get in a truck.
Also, we already have ice cream trucks that aren’t self-driving. For self-driving vehicles to become popular for something that we don’t use regular vehicles for, the main reason we don’t have it would have to be the cost of driving, but not the cost of the vehicle or fuel, the need for too much space, or the efficiency of doing it on a vehicle. Almost nothing fits in that category. (And if doctors want to make house calls, they can just drive the vehicle themselves. Self-driving cars aren’t going to save any money compared to that.)
You have specialized trucks that sell ice cream because the cost of traveling to an ice cream seller is high compared to the benefit gained from the ice cream, often so high that it wouldn’t be worth it at all unless you happen to be a block away from it, not to mention that ice cream is often sold to children who have limited ability to independently travel to a store. And even then, they haven’t driven ice cream parlors out of business, and the ice cream you’ll get there is probably going to be better than the ice cream you can get in a truck.
Also, we already have ice cream trucks that aren’t self-driving. For self-driving vehicles to become popular for something that we don’t use regular vehicles for, the main reason we don’t have it would have to be the cost of driving, but not the cost of the vehicle or fuel, the need for too much space, or the efficiency of doing it on a vehicle. Almost nothing fits in that category. (And if doctors want to make house calls, they can just drive the vehicle themselves. Self-driving cars aren’t going to save any money compared to that.)