I disagree with this... I personally would walk out of a restaurant if there were no human chef's or waiters... I don't think the quality or the ability to prepare the food safely can be programmed into a machine... to many factors.
Key word here is "speed" the arrival of robot-powered restaurants. In other words, the robot-powered restaurants were already inevitable (within then next 10 years is my guess). Higher minimum wages only speeds up that process a bit.