Comment by porjo

The traditional way of ordering a drink at a bar requires a small degree of engagement with your fellow patrons and bar staff. In my experience people under 30 just don't want to 'engage' with strangers: make eye contact, smile, make small talk. I've noticed this in the work place with younger colleagues and with hospitality staff in general. It's not surprising they would prefer to form a queue and take their turn before hurrying back to the safety of their group of friends.