If I had a restaurant I’d move to touch screen/cell phone ordering only and text or signal the customer when their food’s ready so they can pick it up themselves. And lower prices commensurately.
That's Panera Bread.
All restaurants will be called Panera, instead of Taco Bell (demolition man) :>)
Jack in the Box in San Diego has a touch screen with credit card swipe for ordering. You do the ordering/paying and get a small paper receipt to pickup your order from the kitchen. In time, there will be a fully automated robotic kitchen with limited human interaction to clean and stock the robots.
The full service lunchroom at my office in San Diego was transformed into a self-service with debit card swipe. Security cameras monitor to catch cheaters. A "rover" restocks the refrigerators and shelves every other day.