I see if coming for the younger generations. I look at my kids 25, 22, and especially the 16 year old is already growing up cashless. I make him pay in cash so he has this reality but his friends and the college kids are already using palm scan in our NC grocery stores. Our colleges are already set up for kids to shop and eat in the cafe this way, shop at the book store this way. We have robots here that "inventory scan" but I think watch for theft aka drinking the drink and putting the bottle back on the shelf, etc.