As there are starting to be more and more Linux systems that aren't GNU anymore (think of all the Android tablets, to start), I can see the GNU/Linux distinction becoming more important. Because, when you get down to it, I acutally do want a GNU system. I might very well install Debian GNU/kFreeBSD one of these days, but I want the GNU.
I'm exactly the opposite--I'm looking forward to the day when I can run a GNU-free Linux with no stupid compatibility issues. It'll be hard, given how badly 20 years of GNU has broken Linux, but maybe someday it'll happen, and we'll have a decent C compiler and a non-bloated /bin.