This data seems inconclusive to me until 6.5/6.55 is released. Its a very common trend to lose subs after .1 in most expansions. I have several friends that will unsub until then since they solely care for the story and playing with friends and usually do a 'catch-up' week or two until the new expansion comes out. Combine this with the growing sentiment that the game is boring and you can see more people unsubbing.