Power draw is definitely not the whole picture. I upgraded my PC GPU from the 8800GTS which used around 115w to a GT240 which uses about 65w and is slightly more powerful GPU wise.
Then there is the fact that generally the only PCs which concentrate on optimising power efficiency are laptops and tablets, so its not good comparing to desktop GPUs. Depending on how much Nintendo tweaked the architecture of the GPU from the stock its clear there is plenty of potential for reducing power draw.
Also, I believe a big reason Nintendo wanted to keep the specs low is not just cost, but form factor.
One of the big selling points of the Wii is that its size and relatively silent operation, made it fit in the living room without being intrusive.
When I first got my Xbox 360 I HATED how noisy it was, I don't think the Wii would have sold anywhere near as well if it had been as big or noisy.
I'm certainly hoping the Wii U will not be significantly louder than the Wii, it will make it awesome for Netflix which I am currently running on a PS3 Fat which is annoyingly loud.
Uh, no one said any of the things you are attempting to retort....
And you brought up that a 2009 card that takes less power than a 2006 card is a little more powerful... But that was already brought up, along with the fact that if you had a HIGH range 2009 gpu instead of a MIDrange one the power draw would be more in line with your HIGH RANGE 2006 gpu.