One of the points he makes to support this, is that for any language to become as good as LISP, it would actually need to become LISP. While it is a cogent point and well argued, I don't buy it. More precisely, this is what he writes on what it would take to add the equivalent of LISP macros to another language:
But it would be hard to do that without creating a notation for parse trees; and once you do, your language has become a skin on Lisp, in much the same way that in OS X, the Mac OS became a skin on Unix.Hmmm...I am not sure that this analogy is making his point, because Mac OS X is far, far superior to raw Unix for most people, and preferred by hackers, as he himself writes in Return of the Mac:
All the best hackers I know are gradually switching to Macs.Of course, I may be stretching the analogy too far, but it seems to me that it doesn't support Paul's thesis of LISP superiority, but rather clearly points to some language Y that delivers LISP's power in a much more useful and usable form.
Any ideas what this language Y might be?