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.