He said it was rhetorical, meaning he doesn't care about XaviX or MSX. I've seen MSX in action once, although I've never seen the XaviX, just read about it. Frankly, I don't care.
The Wii's innovation is that it uses motion sensing technology in a fresh, exciting way...nobody cares that it stole XaviX's thunder as you put it. That's just how the gaming industry works. Nintendo deserves more credit for their marketing strategy and getting the motion sensing console known.
Thank you BK