A lot of individual projects make Linux and any other open source Unix-like system possible, I don't see why GNU deserves more credit than those other projects. I think I'll stick with Linux.
I was not thinking about whose credit it is, more about the logic of it. Calling it Linux could lead to some paradoxes. How would you for instance describe Debian GNU/kFreeBSD or Debian GNU/Hurd? "Linux without Linux"?