Actually to me the reasoning behind Nintendo is quite clear:
Last generation GameCube was the most advanced (before XBox came out anyway) gaming machine out there and it didn't get the sales the technically inferior PS2 continued to have.
Labs come up with dual screen "gameboy". Nintendo sells it as DS as to not tarnish the Gameboy brand if it fails (virtualboy!). Sells like hotcakes.
Nintendo has a look at labs again. What goes along these lines for home console? Wiimote with pointer and motion sensors. What do consoles lack that PC's have? pointer. What does DS have that gameboy didn't? pointer. What is the new thing being introduced? motion.
Can we do it as a Gamecube add-on? yes we can... but developers would have to support it. This usually means 2 to 3 titles TOTAL (look at eyetoy support on PS2) since 3rd parties don't count on customers having add-ons. Also, Gamecube never really took off.
Solution? bump the Gamecube hardware a bit (like DS is a bumped GBA) and make the new controller the default one. Make it cheap to expand (the connector at the base is pure genius, means no extra wireless hardware). Market motion controls heavily. Make the whole thing really cheap to regain market share lost with Gamecube.
ALSO: Most people pointed out the Gamecube looked too 'kiddy'. Take a page (or the whole book) from Apple, make it sexy.
Now, �is it 'gimmicky' ? those who say that now will soon change their tune, when Sony and Microsoft are singing the same song. (Natal, motion controls for PS3).
Me, i'm all up for innovation. I have a WHOLE BUNCH of ideas for motion control. Go play Metroid or Conduit on WII and you'll see the worth of the pointer. Motion also has it's advantages but they'll be a hard sell here so I'll just point out that I feel they've been badly used so far (mostly).
It just saddens me to see what ISN'T being done on Wii.
Anyway. I just purchased a controller to fool around with on PC get some experiments done.