I actually wonder if developers can take the Mii characteristics like where's the nose, how big are the eyes etc. and use it with the distinctive graphical style they've developed for their games to draw a look-alike of me on the screen that matches the game. So it would still look like me, bit not like the LEGO Mii playing Wii Sports. That would make room for a lot of Mii supported games. Probably not going to work technically, though changing clothes should really be possible, as Wii Sports is already doing that. Oh, and 30% of households by 2011 is just another way of saying "35 million units in the US". That's less than what the PS (40 million) and PS2 (45 million) achieved, so nothing record-breaking just yet.
Hardcore gaming is a bubble economy blown up by Microsoft's $7 $6 billion losses.