Wouldn't the best thing for those concerned about it be to simply re-register using a name not their own?
Honestly, I wish I had remained "Lo" simply because of Google and all the other assorted search engines out there. It's not so much that I fear an editor will turn down a poem because it's considered "previously published" because I'm really not convinced that's the case in most instances. It's more that my few actual publishing credits are being systematically pushed down on the "list" which appears if my name is googled because, now that I am using my "real" name to post here, all the damn Erato threads are showing up first. It was a non-issue when I was "Lo" since Google is/was incapable of making that sort of association.
I would think that if an editor was checking to see if a poem had been previously posted anywhere on The Web, he/she would google the poet rather than the poem. If I'm wrong about that, and someone's concerned about an potential editor searching for publication/workshopping by title, just retitle the damn thing when you submit it.
I'd hate to see Eratosphere go "private," though. I'm pretty sure there are as many of us here who've been published
because we've posted here as there are those who've been turned down because of it. I know I've had poems workshopped here which have been noticed by various editors, as has Dan, and I know several other posters who've also had the pleasure of getting one of those letters which says, in effect, "I'd really like to publish _________________ which you've posted over in The Deep End."
Like most things, posting a poem in a workshop has the potential to cut both ways.
Lo