[stubish]

The most overall efficient method is robotizing the store and deliveries, yes. Which a consumer is powerless to do. But if a consumer can buy a generalized household robot, it becomes cheaper the more tasks it can perform, amortizing the cost over the total work done. A generalized household robot will become practical when it becomes cheaper than hiring staff or carers. There is most certainly a market with the elderly and others requiring assistance for a robot capable of going around stores meant for humans.