I really don't see why it would be called GNU/Linux. It's a good abbreviation to just call it "Linux". No one would argue that the kernel isn't the most important part of the system. Linux is the kernel, where the GNU parts are less important (while still integral to the system). Where does it end? There are numerous critical tools in a Linux system that are from the BSD crowd, should it be called BSD/GNU/Linux? I can see it now: "Is it too much to ask that you type eight more characters?" Or maybe we should just go all the way and name every group that made any part of any particular distro. After all, it's all included in the "Linux CD". Where does it end?

The Linux kernel is the most basic part of the system. It is the lowest common denominator and as such, it makes sense to call it "Linux" and not "GNU/Linux".