It is interesting, how if someone doesn't like something they seem to see it as their mission to make sure no one else uses it? (or it appears that way, what I think it really means is self promotion, and its easier to tear down then build up when building your profile in public).
Actually in this article, when I re-read it, I think it is written in a sort of ironic/fun tone.
Although I love clojure, I understand the disappointment in not being "lisp all the way down" - there is something satisfying about the purity of that approach, if it is practical. Maybe one day...
I think it's a great language. As much as I value purity from an academic standpoint, I also need to eat. I'd rather see a 90%-pure Lisp that I can get a job in than a 100%-pure Lisp that I can't.
Moreover, I think Clojure will get more Lispy, rather than less, over time. In 2015, I think far fewer people will be programming in Java full-time, and the JVM will be optimized as a VM to support higher-level languages rather than to support Java as a primary language.