>Clojurescript is, let's be honest, never going to be natively supported in Google Chrome.

Not quite sure what you mean by this, but source maps, syntax highlighting and other native extensions were added by the Chromium team over the last year specifically for Clojurescript support.

But, as far as a language running natively in Chrome, none of the languages that transpile to JS do, not Elm, Purescript, etc, so I'm not sure what exactly you are referring to.