>> Gaming is stigmatized by non-gamers
How do you figure? This sounds like it's simply conjecture or personal experience at best... in which case I'll mention that I know plenty of non-gamer professionals who respect gamers. Even if it is stigmatized, it's becoming decreasingly so as older gamer generations age. And the widespread immaturity made possible by total anonymity is a big reason people don't respect the gaming community in the first place. I welcome changes like this, which only serve to accelerate the de-stigmatization of gaming.
>> lots of users will stop playing these games for professional reasons
Why would someone who wishes to remain anonymous stop playing a game, when they can instead simply stop posting on the forums?
>> They don't understand how much they're giving up people's privacy
The "invasion of privacy" flag is waved nauseatingly often. It is not an invasion of privacy for a site to allow you to intentionally make posts under your real name. Blizzard is not tricking you, nor are they exposing your personal life without your permission. They are simply changing the dynamic on their forums to one that places a higher value on personal accountability. If you don't like it then fine, but don't accuse the company of being unethical. I'm sorry, but you don't have a right to be anonymous in everything you do.
People really need to get with the times. For the past 10 years we've lived in a world where people can Google your name and find anything about you. And for the past 5 years, we've lived in a world where more and more online services aren't supporting anonymity. That's the future, and yes * gasp * it's different than the past. Instead of complaining about change, why not adapt and take steps to control your own online reputation?