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Everyone is slowly reinventing SOAP :) (Note that RDF can modelize graphs natively, has native support of types, IDs and labels, and has a javascript parsing library, a bit more powerful than JSON.parse()).

Because XML is a much worse match for everyone's data model than JSON is.

Data structures aren't marked-up text. And that one time that XML was supposed to be used for marked-up text (XHTML), it wasn't even good at that either.

A json-based format still has some advantages depending on context. E.g. JavaScript code can manipulate JSON data "natively" whereas XML support is far harder to achieve.