Author mentions Clojure a few times as an example of shiny-thing. Ironically, it's one of the few languages that I can reliably do in the browser, on the backend (on real servers or say, Lambdas), and build native binaries for -- which addresses the later "many tools" problem better than a "boring" programming language like Ruby. Unless you don't care about frontend code I guess :-) (Overall this talk is fine! I thin…
But: - good luck finding a Clojure programmer if your current one quits. - good luck finding answers for your exotic bug/performance issue etc. Code is a liability, it's much more than language/VM/compiler features
I can't imagine why anyone would have any difficulty finding and hiring good Clojure (or really, any functional programming language) programmers.