When the touch screens don't work or get the order wrong is the customer going to want to complain about their issues with another touch screen or a person?
I've already seen fast-food-type restaurants have this kind of tech installed in the U.S. They always have cashiers on hand, because there are always going to be people who do not want to interact with the touchscreen.
In fact, from what I've seen, touch screens only get used when there's a long line. People don't like interacting with them. They're cold and needlessly complex.
