I just want to add something, most people think the game "succeed", but in reality it didnt. Yes it made some money for SE, but SE business forces you to sub. Now i'm not denying it had some good subs, even milions, but the truth is, this game is a fast burning candle, and in my opinion any serious developer would avoid taking that path, i see less and less players playing, and dont be fooled by SE market claims, they will never share the actual amount of playing customers.
You'd want to keep a good income, people been telling them since day 1, i'm afraid if they dont start listening, at first sign of another good mmo, this game will be desert, we are past a point of no return.