Monetarily, you may not consider 1mln subscribers as a failure.
But you also shouldn't be considering a game on a downward trajectory as a successful thing either. All it takes is for that trajectory to hit a threshold that they are not happy with before you start seeing more monetization in the game and ideas, e.g., more subscription tiers, that offer more than just additional retainers or character space per server, more cosmetic items on MogStation, more mounts which would've been suited better as in-game rewards (e.g., Shadow Wolf), and so on.
As I do honestly think they would flirt around with this ideas far sooner than they would consider turning the patch cycle and predictability on its head.