But I would definitely buy coffee from a vendor like this. What other captive markets could you sell coffee to ? Where do people wait in line a lot ... Texas DPS would be a gold mine.
Train stations and airports. Onboard trains. Amusement parks. Maybe not a lineup, but anywhere people gather, such as city parks and tourist attractions.
The first time I saw this setup was actually in the 80s. I was skiing and one of the hot chocolate companies was sampling a new product. There was a guy, on skis, at the entrance to the lift line handing out samples using one of these thermos backpacks. It was styrofoam cups in the cup dispenser back then of course too.
Either way, there is something really compelling about having a hot beverage brought to you right when you need something. I can see the appeal of having this service in a traffic jam, now only if they could figure out something similar for bathrooms.
Someone handing you individual sheets of paper on demand?
I can’t think of a place less congenial to anything edible/drinkable than a bathroom. Yuck!