This is the dumbest thing Microsoft can do. The only logical reason I can think for doing it is that they want to rebrand it in a way that benefits only them.
When a nickname for something sticks with people, you don't try to change it, no matter how much you think it doesn't make any sense. For example, a cable modem is NOT a modem, because "modem" is short for "modulator-demodulator" which basically means it's converting digital signals to analog and vice versa. A cable modem deals strictly with all digital signals, so there is no (de)modulating taking place, and therefore it's not a modem. Still, the term "modem" became the word commonly associated with a device that connects people to the internet, so even though it's no longer accurate, it's not worth trying to change. Once people have made a word/object association, they don't care whether it's inaccurate or not. Trying to change the word/object association will actually confuse people far more than leaving the inaccurate term in place.
Furthermore, with the wired (or wireless, if you prefer) world we live in today, most kinds of work involve some sort of network or internet access. I find very few things I need or want to do on a laptop that can work locally without any internet. So, I argue that "netbook" is NOT an inaccurate term at all, and the all-encompassing phrase Microsoft wants to replace it with, though maybe slightly more accurate, is far too cumbersome to remember.
Microsoft, I have three words for you: KNOCK IT OFF!!! If it ain't broken, don't try to fix it.