As far as I can tell, the only thing that leading accessibility experts agree on is that nobody listens to leading accessibility experts, especially not the microformats cabal, which has never cared about accessibility, has never bothered to test it, and has never acknowledged those who have tested it. In fact, the BBC recently removed one microformat from their site because one piece of it may be confusing to some screen reader users with a certain non-default configuration. This proves what leading accessibility experts have been saying all along, that all microformats are inaccessible, and we should all just use RDF.
Meanwhile, the devilish cabal is secretly solving the problem on their public wiki page, their public mailing list, and their public IRC channel. But will it be enough for the BBC? Be sure to tune in next week, when we'll drown a leading accessibility expert to see if she's a witch.