I will probably unsub as soon as my guild kills hc garrosh (maybe wait for 2-3 weeks to have him on farm).
I probably won't resub, unless they change the current design philosophy. If they stop treating all players as idiots that need to be spoon-fed streamlined content and make more aspects of the game besides heroic raids challenging (at least optional challenges while leveling, true heroic 5-mans that are not challenge modes etc.) I might re-sub for the next expansion.
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Also, that.