There are no more hardcore players left in wow, sure a lot of players that used to be hardcore still play wow casually now. Hardcore is by design and you choose if you feel it's worth being hardcore. The game doesn't allow you to be anything but a casual player now. Also all these players that say they casual often spend more time in wow then players that play for guilds like paragon, who just put a lot of initial time in to clear the content and then can focus on other area of the lives and still be successful.
There is a lot of people that still login into wow just for the purpose of chatting with the ingame friends they still have, I mean there is so much better things to do in life then to be 6 months > into Dragonsoul.