So, Yahoo acquires Viaweb and rewrites it. The end result
  is inferior to the original Lisp-based product. Sony
  acquires Naughty Dog and decides to eliminate the
  Lisp-based development infrastructure. The end result is
  an inferior game development environment. Sure, there
  were probably a lot of reasons for these decisions by
  Yahoo and Sony (probably none of which had anything to do
  with productivity or technical excellence - large
  companies have other drivers which have more importance
  than these two); however, the end result for both
  companies has been something inferior to what they
  originally acquired.

Edit: The post has more about in what respect the author considers the replacements inferior.