I think that's also why Clojure use peaked right before Java 8 was released; once Java became a better Java, and libraries started to be designed around more ergonomic APIs than wiring up objects that needed miles of stateful configuration code, the pressure that drove you out of Java and into Clojure began to diminish.
Hardly. Despite being Java-compatible Clojure's philosophy is diametrically opposed to that of Java/OOP so anyone who has experienced the benefits of Clojure would hardly return to Java simply because it managed to fake FP with Single Abstract Methods.
Well, maybe there were not as many die-hard lispers within the Clojure community and many were looking for something that handled better than Java 7. I know two other former Clojure programmers that went to Scala, but also find Java passable enough to just use it rather than Clojure.
