The problem is, as wages and COL go up, this gets harder and harder to do. Humans are expensive, and as they keep getting more expensive, it stops making economic sense to use them for low-margin goods and services like lattes. Notice how we don't have elevator operators, pump station attendants, etc. anymore, because eventually it became uneconomic to do that with people instead of making the customer do it themselves.
The future for most retail and food service businesses is fewer people and more automation (e.g. ordering at your table via an app and the server only comes by to bring your food); it can't really be any other way unless you want your food subject to Baumol cost disease.