I predict a long and costly investigation by CASA, taking no less than a year, at the cost of around 2 million dollars. The inevitable result will be said pilot loses his license and launches a string of ultimately unsuccessful appeals, and a whole lot of new regulations are drafted that jerk us all around.
AVMED will no doubt want a crack at it as well, introducing mandatory liver function tests to check for alcoholism, and "cultural awareness" will be included in the human factors exam.