First of all, I don't see how his comments at the MIT speech were sexist. He never said anything negative about women or about the LGBTQ community - he simply stated that Blizzard doesn't care about politics - they make their game, and that's what they're passionate about. If you've ever actually been to the Blizzard offices or met the people who work there, not only would you find that they have a very diverse workplace, but they are all passionate gaming/RPG/sci-fi/fantasy/comic book/TCG/etc nerds to the core.
It's silly to get mad at him for the company not including LGBTQ characters, or for including overly sexualized female characters, in all their games. Why are game devs so heavily pressured to do/not do these things? Why can't they just focus on making the game as they want to make it, without having to think about all the other stuff?
Second of all, regardless of my opinion on all that, Blizzard wouldn't fire somebody SO important and influential entirely based on some community backlash from a complete misunderstanding. A misunderstanding entirely caused by an opinion piece written by one specific person on the internet, who seemed to be desperately LOOKING for a reason to hate the guy.
There isn't even all that much community backlash on it. I didn't hear about it until I glanced at the comments on this post, and it certainly never made front-page news here at MMOC.
On a lighter note: I really really look forward to hearing about what he's going to do with his life. Will he form his own start-up and design a crazy-awesome game? Will he go work for another company, like old Ghostcrawler did? I hope it's the former, out of sheer curiosity!
Also, how in the hell does somebody as big as this guy, one of the head honchos of a multi-million dollar company that is recognized around the world for their products, decide to leave... without a real plan? O_O