For a comparison -
Wii hit 30M after 87 weeks on the market.
DS had sold 22M after 87 weeks.
Ps2 had sold 16M
GC had sold 8.5M
It took DS roughly 105 weeks to hit 30M
It took Ps2 roughly 130 weeks to hit 30M
This means, that Wii has averaged 344K/week from launch.
DS had averaged 285K/week
Ps2 had averaged 230K/week
Wii is also selling at roughly 3.66 times the speed of the gamecube.
The SNES used roughly 120 weeks to ship 30M.
The N64 used about 210 weeks to ship 30M
The GBA used about 100 weeks to ship 30M
Just to compare, Ps2 shipped 30M after roughly 100 weeks.
The NES shipped 10K for half of a year, more than 13 years after its release.