I'm among the people that really don't care either way. I feel there's places I'd rather not be known by my actual name, but the PSN isn't really one of those. Facebook I've never had problems with, but then again I rarely used it. Places like Youtube and 4Chan however are filled with the dredge of humanity, and I'd rather not give them anything to harass me with.
So I might actually use it, as long as the username is still shown... which is how it's shown on the image in the article. I really have nothing to hide, and letting people know my real name I don't find particularly harmful. Also whether you like it or not, the system will start teaching users to simply not trust those that don't use their real name. Whether you do it because you'd rather be an anonymous ass or just because you're paranoid... doesn't matter, because people will see you hiding your real name and instantly be wary of you.
It's a lot like caller ID. If the number's blocked or hidden, I doubt many of you actually answer it... because you know it signifies illicit behavior.