Even the people in the kitchen are on a short timer I suspect. I've seen videos of burgers, pizza and coffee being made by vending machines (and I know burrito vending machines exist, just don't know if there's one which makes the burritos or if it's just per-packaged ones). While I wouldn't count on a robot-built burger for quality, or a vending machine for the best food hygiene, I would not count on McDonalds for quality or cleanliness either.