Although I find this initiative interesting, and I think the community does too, judging by the responses it has had, I think it goes against the way the forum works today.
Anonymizing, apart from the technical difficulties and possible abuses, I think it goes against the spirit of a forum where progress is based on merit, and that the nickname we are here is defined by our identity on the forum, which is built from the merit received, seniority, total number of posts, feedback, DT status and I don't know if I'm leaving anything out.
Anonymizing that I don't think would be very unbiased, as I've had discussions in politics where the opposing side (and me too) are biased, and I don't think that being two anonymous people instead of me and (for example) suchmoon would make us less biased. Apart from the fact that even if everything, merits, nicknames, trust, etc. were deleted, I think that in some cases we would end up recognising each other.
How about a board where no usernames are shown at all? To prevent spam, let's add some Rank restrictions, and only allow completely anonymous posts there.
I foresee the same success as the “serious” discussion boards.