>You're going to have to pay a lot more. The model can't be sustained at this price.

It will be much cheaper once there are self-driving cars. You don't have to pay for the drive, just for somebody doing the final delivery from the car to the door.

It will be even cheaper, if customers are willing to leave their house and fetch the food from the car at the street. Then you don't have to pay anybody, just some cents per mile for the vehicle.