This. Set aside that Javascript has hit "peak speed", its failures for large codebases are fundamental [1]. I don't agree with the Google hate, but I can understand. What I don't understand: outright denial of the possibility of something better than JS.
(for my personal projects, I genuinely love JS)
1 As someone who works in a large organization, I live this. Small groups with great programmers can make use of all the many tools and tricks for maintaining their project, but for teams fractured across time and space and governance, it is no fun.
The "absent browser-manufacturer consensus" limitation in the post suggest that the hope is that a better development platform won't come with the cost of a fragmented web; i.e., that whatever the choice is for improvement (Dart or something else) it won't be one or more vendor-specific targets, but one broadly-accepted target that can be used freely without worrying about either locking-out users of other major browsers or providing different browser-specific alternative s.
Since no general use browser implements the Dart VM, no one would do that, so its really pretty irrelevant.