I've just started running into the "unneccessary to cater to special interests" argument aganst pseudoanonymity on g+, and I haven't seen any data that indicates that there are more people who generally use their real names on the internet than ones that generally don't. I'd love a link to anything like that from anyone.

But in any context on the internet other than the social networks in question or when people are intentionally marketing themselves, if I see someone using their first and last name I assume that they are either very elderly, or very new to the internet. When I'm commenting on tech blogs, I'll sometimes use my firstname.lastname resume-heading email address - but I'm a tech guy, so it's obvious why. I could also see eventually using a real name on hn, but only for the same reason.

An email address is the id most people got first when they got on the internet, and is the model for pseudoanonymity. When I email my grandmother, I am pseudoanonymous and she is pseudoanonymous; it feels like the default state of the internet.