Amazon could be very successful if they setup "grocery warehouses" in local areas and just delivered groceries to people. It's not a wildly different model than the current grocery store, just with less need for prime real estate and you'd be paying delivery people instead of checkout people.
It can be done and it can be done profitably, it's going to be more about finding people who don't want to spend their time going to the grocery store.
It can be done and it can be done profitably, it's going to be more about finding people who don't want to spend their time going to the grocery store.