have you been inside of a McDonalds lately? They're already moving in this direction. Most of them have kiosks and one or two registers now and the cashiers will try to force you to use those kiosks to place an order unless you're paying in cash. Last time I went I told the chick tried to tell me to use the kiosk and I said "Yeah, I don't work here, I expect my order to be taken by a person", to which she responded by whining about how she's the only cashier and she's the one running orders to the cars that ordered ahead.
"You know... in the amount of time you took to explain that to me, you could have just taken my order..."
She took my order, then ran outside with a bag in her hand for a car that pulled up.