It should be an easy road to 82 million this holiday, as Wii has a stronger lineup of games this holiday than they've had all 2010 so far as well as continued momentum from NSMB. DKC and Wii Party will be the biggest, with Kirby, Goldneye, Just Dance 2, and Epic Mickey all performing strongly as well, and have the potential to give at least a moderate boost to hardware.
As for the 100 million by the end of next year, it's a tall order, as the Wii will likely be in further decline, be a year further from the NSMB boost, and will probably have further thinned out releases. It could reach that mark by then, but Nintendo will need a few things to happen; a price drop, a steady lineup of releases, and Vitality Sensor has to be a hit.
When it's all said and done though, Wii should end up with around 130-135 million lifetime, falling just short of the PS2, but easilly beating the PS1 and GBA. However, if Vitality Sensor becomes a mega hit similar to Wii Fit, the console does have the potential to achieve up to 150 million sales, edging out the PS2.