That would pretty cool, but one of the biggest reasons jQuery exists is because browsers don't standardize on anything, which makes the idea of native jQuery a bit of a paradox.

Another big reason jQuery exists is because standards change. You can use jQuery.ajax without worrying about a change in the XMLHTTPRequest API, because jQuery will support the old and new version until some point where the old version is considered "too old".

That second reason is the necessary evil that would exist, even if jQuery became the built-in standard.