There is different way to read the article. It says that the current fashion for rapid development using Ruby/Javascript/PHP/<insert interpreted language here> is great, but eventually, to enable you to scale effectively rather than just buying more EC2 instances, you will have to identify your bottlenecks and reimplement them in more efficient languages. This involves hiring experienced software developers who can develop secure C/C++ (I might as well mention Java, I don't like it) without the code being available to everyone.
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There is different way to read the article. It says that the current fashion for rapid development using Ruby/Javascript/PHP/<insert interpreted language here> is great, but eventually, to enable you to scale effectively rather than just buying more EC2 instances, you will have to identify your bottlenecks and reimplement them in more efficient languages. This involves hiring experienced software developers who can develop secure C/C++ (I might as well mention Java, I don't like it) without the code being available to everyone.