The "Amazon Go" concept involves customers scanning a code on their phone, walking in to grab groceries, then walking out and being charged on their phone.
Think about the "self-serve" evolution. In high school, I worked at a gas station at which *I* pumped your gas (whatta concept!). We have got self check-out lines. In France, I ordered at a McDonald's from a kiosk - there were NO employees behind a counter to take my order. (In Iowa, many McDonald's now allow a choice of ordering at the counter, from the kiosk, or through an app).
Had this self-service concept been suddenly foisted on us, I doubt we'd be comfortable with it. But this now just seems like a natural evolution.
My big question: my wife usually sends me to the store with a list that contains ONE item that I've never before purchased. (I think she does it on purpose). I almost always need to ask for help. I guess I'd be out of luck at "Amazon Go." Unless the app features a grocery item GPS locator...