I will quit if the game becomes too predictable.

You always know what you're getting when it comes to other MMO's. Raid, raid, battleground, raid, more quests, higher level cap, shinier and bigger. More of the same for 3+ expansions.

Right now this game is not very predictable and the developers have quite a few different contents planned for the future. But if it ever comes down to only expecting the same overall structured raids, sidequests, level cap raises and arenas with small twists to be released year after another, I'm out.