Seems like a good idea to me. I think a majority of errors when ordering food at a place like McDonalds or Taco Bell comes at the interaction between the cashier taking your order and you. Think it'd be nice to just walk up to a lil screen, punch in what i want, pay, and go have a seat while waiting for them to call my number.
Someone posted about Chili's up there using some automation, now there is where I find it inappropriate. When I go to say, a "sit down and be served" restaurant, I want that wait person there doing what they're supposed to do: serve me. It is the reason i came to that kind of restaurant.
People just need to make a distinction between the kind of restaurant that is more of a self-serve, and which kind is a be-served. One can benefit from automation, the other is hurt by it.