We should add namespaces to JSON. And schemas. And schema validation. And stylesheet transformations. Yes, that would all be good...

Extensible types would be the next thing to add.

Now that'd be a good extension.

And we could call it Extensible JSON language. A good abbreviation would be XJL.

And eventually we'd have a standards-body defined way of querying JSON documents. We could call it JQuery.

(</sarcasm> just in case...)