Whats your evidence that the game is dying? Subs went up drastically on HW launch, and go up and down naturally over the course of the expansion. When a patch hits, subs peak then decline, with each patch bringing in less and less people (because patch content is the same stuff), then the expansion brings in another drastic wave of subs (perhaps even higher than HW), and the cycle starts again. Level potions don't fix this problem, a smooth and positive reception to the expansion from the start does, which HW didn't have (and it lost a good number of subs during the dark days of 3.1).