If you're a regular reader of the official World of Warcraft forums, you're familiar with this idea. For every patch, every tweak, every proposed change, there are ten threads (at least!) suggesting this will be the one change that will kill the game. While the forum speculation is usually a bit over the top, they're inspired by a legitimate fear: with the many changes Blizzard makes to the game, there's always the chance that one of them may spoil your particular style of gameplay. So this morning I ask: what change (by Blizzard or otherwise) do you think will really kill WoW?