28 pages and counting, this thread is far past silly at this point.
Considering everything, these are very healthy sales numbers for the game, as is the slight bump in subs. You'd have to be some sort of stock analyst to spin this as bad simply because sales didn't exceed Cata, and the game isn't back up to Wrath sub numbers. MMORPG subs and growth, much like most consumerist / business endeavors, is not some infinite pie. If your econ professor told you otherwise, you were lied to.
Did it sell as well as the past few expansions? No.
Did it sell more than it's modern competitors, and still make an absolute killing in terms of development / investment vs profit? Absolutely.
Is this game going anywhere anytime soon? No.
Does the game have the capacity to claim even more subs (old and new) if the patches in store this year are quality / the equivalent of Ulduar 2.0? Absolutely.