Combine the ideas of Walmart and Amazon and the economies of technology will overwhelm the competition.
How Many Robots Does It Take to Fill a Grocery Order?
https://www.bloomberg.com/news/articles/2017-11-06/how-many-robots-does-it-take-to-fill-a-grocery-order
Walmart has the distribution system and pickup concept working and Amazon has the expertise with robots doing order fulfillment. The Achilles Heel at Walmart (for me) has been errors in the orders – usually leaving off items or occasionally the wrong item.
The flaw with the concept in the Bloomberg is the capital investment required. The perishable nature of food limits range over which people can be drawn to a supermarket to just a few miles. The investment to build a robotic food warehouse is substantial, and nobody could afford that in a low margin business.
Today, “order picking” in supermarkets is done be free labor – the customer. Some people actually even enjoy grocery shopping.