Basically Clojure is a nice Lisp designed by a Java/C/C++-expert and programmer (!) (Rich Hickey) for himself. Lots of Java developers find it interesting, because they have similar programming needs. Then they joined him.
Common Lisp is a Lisp designed for Lisp programmers. As a Lisp programmer I want more Lisp, not less Lisp. I also want it close to the metal. If I use 'Unix', I want to have access to C and 'Unix'. Not so much Java. On the Mac I want to interface to Objective-C and C - not Java.
It's not that Common Lisp users will give up just because someone comes up with another Lisp derived language. We seen them a few times: Dylan, ISLisp, Newlisp, R6RS, Arc, Clojure, ... some claimed even that Ruby or Javascript were Lisps. There'll be more in the future.
Common Lisp is a Lisp designed for Lisp programmers. As a Lisp programmer I want more Lisp, not less Lisp. I also want it close to the metal. If I use 'Unix', I want to have access to C and 'Unix'. Not so much Java. On the Mac I want to interface to Objective-C and C - not Java.
It's not that Common Lisp users will give up just because someone comes up with another Lisp derived language. We seen them a few times: Dylan, ISLisp, Newlisp, R6RS, Arc, Clojure, ... some claimed even that Ruby or Javascript were Lisps. There'll be more in the future.