I've never seen a truck driver restock a shelve; what kind of shops are you thinking of? Unloading the delivery of boxes should possible to automate using a robot like those from Kiva Systems, even if harder due to less standard conditions.
Other items were ordered from a wholesale distributer. Those were delivered by truck to the loading dock in cardboard boxes. We moved those into the store, unpacked the boxes, and filled the shelves.
Beer and such was put into the walk-in by the driver, and we stocked the coolers as needed.
It will be a long time before the local ice distributer goes automatic (for economic reasons it makes sense to make and distribute ice very locally). But wholesale distributers? I can see a truck with a lift gate and some kind of robot to automatically unload the truck. We always had to be there to receive anyway, except it was a human with a dolly moving the boxes into the bay.
The manufacturer/distributor sets the price and the grocer could care less whether any sells at all, as long as they find a way to keep getting foot traffic.