On paper it sounds amazing, that you can serve one after the other without too much hassle and less likelihood of irate customers pushing to the bar and demanding a drink despite the fact there were ten people before them patiently waiting. In reality it's far from that. A lot if not most pubs are old buildings that weren't designed for people to stand in a line and a massive queue of people will encroach on other operations of the pub, block routes to toilets, exits, etc.

What I think would work better is having a dedicated section of the bar, kept clear so that nobody is allowed to sit or stand at unless ordering a drink. The pub I work at is divided into two main sections, the bar area itself and pool area, with ample seating all round. I've noticed a growing trend lately on nights at full capacity (not just in my workplace but a lot of other places around) where the pool area is abandoned, and EVERYONE is crammed up to the bar in any available space they can find.

What you're getting is every single barstool occupied and their mates or whatever standing next to them in a high traffic area, meaning you literally have to force your way through a throng of people to get a drink. The only way to get out the back to the car park, beer garden or toilets is also this section, so what you have is forty to fifty people packing themselves like sardines into the highest traffic area of the building creating a potentially dangerous situation.

Current system works better, what's needed is something to keep the bar area clear as possible to maintain smooth operation.