Blizzard has decided that forcing people who want to post in their fora to post under their real name is bad. In a letter released this morning Blizzard CEO, Mike Morhaime says that they still remain committed to improving their forums. One of the new features they plan to add is a Slashdot like feature where you can mod up or down forum posts.
Blizzard most likely got scared of the backlash from the forum community in the RealID announcement thread which reached 2495 pages in three days. I briefly read a few pages from the thread and it appears it consists mainly of hate towards the new system with very few supporters in the crowd.
It appears that in the end Blizzard acted like a good company and listened to their customers. Should it have taken 49 896 posts to get this point across, I think not. However in the end Blizzard will let you keep your semi-anonymous privacy, however I would still be weary of future Blizzard decisions, seeing that they are obviously willing to violate your privacy.