It's good, but the list of "success stories" that he links is not very impressive (scheduling software for NASA is by far the coolest stuff). Python has http://www.python.org/about/success/; Ruby has e.g. (early) Twitter and Metasploit; PHP has e.g. Facebook and a crushing market share; C has a zillion stories starting with the free Unixes. Yes, these languages have their issues. No, scheduling software does not beat Unix.