Unless something changes drastically, there will never be a "Delete Account" feature, for a couple of reasons. Mainly, deleting an account will leave the database in an inconsistent state. What do you do with the comments/stories/diaries/etc. that the user wrote? Delete them? That would leave orphaned comments, so that's no good. Link them to a generic user instead? That's still not ideal.

You could make it so that all user information is removed, leaving just the uid and nickname, so that the content is still linked to someone, but the account is no longer valid. But that's not much different from just not using an account anymore, except that some extra, non-user-visible data would be removed, and it wouldn't be possible to log in to. And, of course, that's not true user deletion.