Me and my buddies were flying for vacation and we were in an airport that does that already. Somewhere in the southwest. So you just go to different airport bars every two drinks. Bar hopping isn't that brazen a concept.
Unless they start tying your purchases to your plane ticket, this just seems like it will create more mobile drunks. It would be nice if they actually enforced policies against people too drunk being allowed to board a plane. I've seen people that were very visibly drunk and loud walk right on.
I guess telling a super drunk person they can't board is more likely to instigate an scene than just waving them onboard and hoping they pass out. Aside from being annoyingly loud and drunk, I was only ever on one flight where someone became a problem, and basically they got into a drunken yelling match with someone next to them.
They got moved to a seat in the back and told if they didn't calm down for the rest of the flight, the police would be waiting for him. He grumbled about it and passed out.