Online, real names provide anonymity
swizec.com
swizec.com
Anonymous - "lacking individuality, unique character, or distinction"
Plus, you are conflating "anonymity" and "strong pseudonymity;" that's what I meant with the initial comment. (For example: if you were actually posting anonymously, there would be no easy way to link "Swizec" posting the link with "Swizec" replying to my comment. In this case, they are linked not only by the name, but also by your HN profile)
And if HN worked the way social networking seems to be going, where names are used instead of nicknames, you could have a "Swizec" posting the link and a completely different "Swizec" posting a comment and they'd both just be shown as "Swizec".
And a 1000 people isn't very strong focus at all, depending on your resources and how interested you are. You suddenly need a lot more data than just the name to pinpoint anyone.
In my opinion, false and false: you'd effectively 1) make your identity your pseudonym, and 2) as such, would be trivially cross-linked to your RL identity, even if (and that's a huge if) thousands of people were using the same real name as you are.
In my case, there are actually hundreds of people using the same real name as I am - yet, it is quite obvious which one is which, from the way the identities are linked together (e.g. many of my profiles share the same picture of me, my professional profiles all list the same experiences, my location, etc. etc.). See, your identity is not only your name - it's a cloud of all the things surrounding it.