There are relatively simple answers to this problem: it requires a will to resolve it and some decent co-operation and co-ordination between the relevant parties at the Airports. They all know the 'general' flight destinations that the 'target groups' will be flying on.
If they have a 'purge' and a) insist the bar staff at the airports warn people not to have too many before flying, and refuse service to people who are clearly OTT b) have additional security and police around for the 'target flights' and c) refuse offenders boarding at the Gates , then I reckon that the penny will drop with the people who over do at, as they'll either miss their holiday or have to pay out big time for subsequent flights......
at the moment, the 'guzzlers' know it's a free for all and they can do as they please.......