This guy seems pretty focused on XML based standards, but I think the reason XML based standards are dying is because people don't like working with XML.

The entire publishing and standards industries are built around XML (JATS and other XML formats). They use XSLT to generate HTML, PDF, EPUB, and other format files.

I don't see the XML-based SVG image format going anywhere.

The ODF, EPUB, and other formats also use XML. Those are not dying.