> I took the view that bartenders would be the last occupation to be replaced by robots because if the goal was to minimize the cost to consume alcohol people wouldn't be coming to bars in the first place.

For a traditional bar, I agree. In places where the "bar" is not the primary attraction, such as sports arenas, concert halls or even some types of night clubs, the bar may be just a bottleneck where you may have to wait 5-15 minutes to order a drink during breaks. If you could order your drink on the phone, and have a robot (or even a waiter) serve it at your table, it may be quite convenient.

There could still be 1-2 bartenders in the bar in places where there used to be 5.