Their solution is shopping online, then you drive to their store and they put the groceries in your vehicle. See: "How Walmart plans to transform the way we buy groceries" from 3 months ago.
They are thinking this is perfectly suited to young Moms with little ones in tow as well as anybody else who hates going into stores. The big problem they face is teaching their workers how to buy high-quality produce, dairy, and meats and how to get the people who assemble the orders to be discriminating in their selection of what goes into the bag. Getting a box of mushy strawberries or sprouted moldy potatoes home just one time will really turn people off. What may have passed the personal quality/acceptance criteria for their workers may not be acceptable to customers.
As they say, "You only get one chance to make a first impression."
I did something similar to this at Albertson’s in Seattle. At first, we didn’t have a car and it was very convenient to order online and have the food delivered. I rarely got something that was spoiled or that I hadn’t ordered.
When we got a car, we used the system where they select the food for you and have it waiting for pick up. I still didn’t drive then, and my son didn’t want to go grocery shopping, so it worked for me to order online and for him to take the car and pick up the groceries.