The problem with that is the same problem with self-checkout and Amazon Dash. It's solving a problem the retailer has -- the cost of employees -- by turning shoppers into store employees. But it doesn't really solve any problems that the shopper has because scanning all of your own stuff and laying it out on the scale is so inconvenient that it ruins everything else. The only place where I've seen self-checkout be as good or better than having a checker is Lowes or Home Depot, because they don't require you to weigh each item in turn to unlock the scanner so you can move as fast as a checker can. But I think grocery shopping will be the last place self-checkout moves in in a big way because the grocers insist on weighing everything you buy before unlocking the scanner.