So is our sun - in just a few billion years it will be nothing but a smouldering brown rock
Seriously, though, that 6.2 million subscribers is still WAY healthier than any other MMOs out there. Yeah they've dropped more customers in the last 5 years than any other MMO has ever had. If the trend continues maybe they'll have to consider going F2P in another 5, and shutting down a few years later. WOW is probably past its prime, but it's outlived every game that I've ever seen talked about in these forums as a "WOW-killer" and it's still got a couple of expansions worth of life left in it.