So this topic is obviously all about the image above. So what we see of the past expansions all of you probably knew. The subscriber base kept on climbing and reached its peak in Wrath of the Lich King and then faced an immediate drop after the release of the Cataclysm. It has since then kept on dropping only getting spikes going up when the release of a new expansion was upcoming.
What I wasn't prepared for however was how remarkably fast the subscriber based dropped. In fact it has never dropped this fast EVER so you might say whatever you want about what your favorite expansion is but from the consumers viewpoint Warlords of Draenor is the worst expansion so far. In fact World of WarCraft is back to a subscription number it had back in vanilla.
The question I want to ask you is did you expect to see this? In my opinion it was inevitable that WoW was going to lose subscribers but the rate at which it's losing its costumers surprises me.