The problems with XHTML 2

Jeffrey Zeldman has written an excellent piece on the big problems with the XHTML 2 spec. The authors need to realize that if people can't understand and apply the spec, it's never going to be used. The RDF people don't seem to understand this. Do you know anyone that actually uses RDF and understands what they're doing? Maybe someone should do like Dave Winer did with RSS 2 and start working on the XHTML 3 spec.