In France all our Decathlon (generic sport gear) stores already have RFID chips and checking out (at a free outlet to self checkout or at a cashier who'll basically do the same thing as you) consist of only putting the goods in a basket, the recognition / scanning of the RFID chip is very good and fast. If you walk out with goods you didn't buy the guard will have a notification on his smartphone with the list of unpaid items.
They're already very close getting to "Just Walk Out" from Amazon situation but I'm not sure how expensive putting an RFID chip in every product is.. ?