The way Kosak explains it, the devs definitely want to make sure that there is faction pride for both sides, and, he argues, while the Alliance may be getting beat up, the Horde has taken its share of lumps too. But in the long run, heroes are not born out of easy times. The Alliance will go through tough times, but it will give heroes the opportunity to arise. The Alliance's time is coming.
One thing he did admit to is that Blizzard needs to do a better job of making sure people can interact with their heroes. He acknowledges that the Alliance may not think of Thrall as theirs or part of their story, and he promises that once Cataclysm as over, we will catch up with other characters.
Whether you agree with all of his reasonings and conclusions or not, it's a good read, and it does prove that Blizzard is hearing us and is at least planning to try to address some of the complaints of faction parity and Thrall overload. Check after the break for the complete text of Kosak's post.