I hear the game is dying even worse than Dota 2 (which as we know is basically days from the grave). Blizzard's headquarters is currently on fire and the entire Hearthstone team has been reassigned to work as security guards at King.com. Half the acquisition cost of King was actually just them hiding how much money the game has been losing.Just waiting for big names like Kripp and Trump to cut down on Hearthstone as well. It's a sinking ship, if you're a big time streamer you need to branch out to other games like people like Lirik and Sodapoppin.
They're probably canceling all the game announcements at Blizzcon as well. They won't have any remaining community in the two day wait for updates on where the game is headed so they won't bother.
The Twitch viewers at 69,498 people right now in second place are actually just Actvision paying off Amazon (big corporate loves big corporate!) and it's really more like 7000 people.