A wiki does seem an interesting approach here. My main concern is you need to treat the biased commenters (ie. competitors, and advocates/sock-puppets) different from the unbiased, as the stakes are higher than a typical wiki article. I think you want more a comment system where contributors can add comments, and then amend their comments, but not remove other people’s material. And have a duty to declare their biases.

The goal of the citizen examiner system is to get skilled but otherwise unbiased people on the case.

You do need some authentication, otherwise wiki or comments would get spam. Both from plain old spammers, and also as a denial of service attack on the patents in question. If the examiners have to weed through a lot of bogus comments it slows down the patent.