Airlines are pretty good about holding drunken passengers accountable for their misbehavior but one of these days someone is going to do something serious enough, perhaps to a child, that the airline will be forced to bear some measure of responsibility. They’ll simply pass the losses in alcohol sales off to ticket prices and that’ll be the end of it.
Attitudes have changed. In-flight drunkenness used to be tolerated as a remedy for fear of flying. These days, not so much. Increasingly passengers find drunken behavior inexcusable and offensive. They don’t want to sit next to drunken passengers. They don’t want their children exposed to them.