I was quite surprised to see the tea-making and sandwich-making robots.
I met a startup in Hong Kong, CafeX, who were working on a coffee-making robot, and my first reaction was that they were using cutting-edge technology to solve a trivial problem. I do like good coffee though, so I thought through the business case.
It seemed to fit into an awkward gap between "cheap coffee vending machine" and "cafe kiosk with trained barista". People grabbing a convenient coffee in places like gas stations and convenience stores, care about price over quality and will be fine with a cheap machine. People who like quality coffee will usually prefer a trained barista if one is available, unless they want to try the novelty of a robot.
The two niches I can see are:
1) Inside fancy office buildings, where the drones don't want to walk outside to get good coffee. (The robot is also good for impressing visitors).
2) Places without decent cafes around, i.e. shopping malls, theme parks, airports, where the robot might be as good or better than Starfucks burned-for-consistency beans.