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I haven't seen anything about XML2 elsewhere. Is this just your name for a potential revision to XML, or has preliminary work on a sequal to XML already started?
I too would like to see an XML2, but I think we have very different ideas about what should be included. If it were up to me, I'd improve DTDs and spin them off into their own spec, I'd make XML schema neutral, I'd add namespace support to the XML spec, and I'd allow XML-based languages to specify fall-back options for how to act if an IDREF specifies an ID that doesn't appear in the document (if they can't do this already- I haven't used anything more complicated than a DTD). I wouldn't allow sloppy coding... it's one thing to write a forgiving parser, it's another to require that parsers be forgiving.
As for why XML hasn't caught on on the web, it's not really true. RSS and ATOM are both XML, as are most non-HTML markup formats. The only reason so much HTML is still not well-formed is because xHTML 1 didn't bring anything new that wasn't already availiable in HTML4, other than making web pages harder to code. Imagine how much more slowly PNG would have caught on if it was a subset of gifs and had no advantages. Obviously, no one would have adopted it.
Now, xHTML2 does being some advantages, so I expect once all the major browsers support it web designers will adopt XML en masse.
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