One thing to think about is the way experience has shown that the internet itself was much more ideal when most users were still anonymous and it didn't make a big difference if anyone had more than one "screen name" or not.
Indeed so. I've never stopped using pseudonyms on the internet. I have a few of them I've used consistently for decades. I think the important thing in internet identity is continuity of the identity, not whether or not it corresponds with real-world identity.
I have never used my real-world identity on the internet, and won't start now. I think it's a bit nuts that people are willing to, but to each their own.