It's too early to tell if this game is declining or not because:

1) No one can provide actual statistics about the retention.
2) http://www.dualshockers.com/2013/10/...g-in-december/ They just got another 500k accounts on top of their previous million. We know there's at least 500k playing the game, but then you have the other 1 mil and probably at least 250k of them are still actively playing. so all together, at least 750k are active. ( All speculation)

That's why when people say the game is dead this early on ( 2 months) without proof is baffling to me personally.

About the 6 month mark, we will see how the game is really fairing.