There are marketers who would emphasise the customer service element of the retail environment, but for certain types of goods and certain types of shoppers, human interaction isn't necessary, and can be a hindrance.
The fully-automated shopping models of the future:
- web-based (or app-based) with delivery to your door (or potentially to your person wherever you are)
- traditional-style shops with fast self-checkout or RFID based transactions
- vending machines that take an order (on a screen, from a mobile device, or by voice) and dispense the product