Since the trajectory of the majority of the male characters on Game Of Thrones tends to start with "Become king or die trying" and ends with a head on a spike or a sorceress' fatal stab, it seems only likely that Joffrey Baratheon will either be killed, accidentally kill himself, or be conquered and cuckolded by Arya Stark (hopefully to be kept in a brothel run by Littlefinger). Luckily for Jack Gleeson, his character's inevitable exit will allow him to quit acting and focus on charity work.