"Basically a person that was using more than 20 years of Lisp successfully and considered Lisp allowing higher productivity admits that there are now other languages that allows higher productivity than Lisp."

No, just a case of Stockholm Syndrome. http://groups.google.com/group/comp.lang.lisp/msg/d11c7e5619...

"I wonder what kind of improvements does the author have in his mind! If somebody knows please kindly enlighten me."

As Erik Naggum said: Erann Gat does not want to enhance Common Lisp, he [just] wants to feel better.

I encourage you to keep reading Naggum's line of thought: http://groups.google.com/group/comp.lang.lisp/msg/9edc8f7ee2...