Ok, it wasn't going anywhere anyway (excpet to say that all those authors are in the top ten nost popualr ever... maybe not Isaac Asimov, but then he is the biggest seeling sci-fi guy ever...)
An interesting point to note, thouygh, is that whether Campbell was right or not, his theories have been given 'retroactive' (as it were) credence by its supporters re-inforcing this.
Star Wars is the biggest and most perfect example. Even if the Hero's Journey WASN'T something as engrained as he suggested, Star Wars has now become such a basic piece of storytelling (and is so based on his work) that these parts of Campbell's ideas ARE a very much a part of modern day culture. You cannot write a sci-fi or fantasy story without it being in some way comparied to Star Wars.
Just goes to show...