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The blog says.: "Do we have too many plugins ...". We need the right (in the sense of complete) plugins.
Go (language) in browser is good idea and it must be tried. A very fast compilation offers many advantages. Javascript must enhanced or replaced by a full and complete OO language like Ruby or Python (or Perl 6, why not?).
There is already a large number of frameworks for Javascript. Just imagine the immense quantity and the quality of libraries that community would create.

Replacing JavaScript with Ruby or Python or Perl 6 is an absolutely horrendous idea. Which version? How do we guarantee cross browser compatibility? It's taken us long enough to get JavaScript to work reasonably well. Throwing in some other language isn't going to solve any problems. It would just create new ones.

1) Which version? Say Python 3.1 with the interface to DOM.
2) guarantee cross browser compatibility? The python interpreter is compiled with the browser and it belongs to the browser. So on Windows 7, 64-bit, it is compiled for Windows 7, 64-bit.
3) isn't going to solve any problems: it will add enormous power to the browser + extra libraries.
Developers like Mootools, Jquery, Dojo, would be able to publish frameworks with limitless capabilities and advanced features.

JavaScript is already full, complete and totally OO - it just uses prototypal inheritance rather than classes.

However, this is about bypassing HTML, CSS and JS to create binary executables that run in the browser. It's basically ActiveX with added security.