Wait, because of Mythic? You're a mad man if you think so. Warcraft has been on a downward spiral since Cata. Nothing they do is going to stop it until it reaches a point where only the most obsessed people are still playing it like old EQ. I'd like to think that'd be around 2 million or so, but it could be even lower. This has nothing to do with the highest raid difficulty and it's raid size because the population of people that actually cleared the hardest raid content is tiny.