90 or 100 million for that matter will only be reached if the market doesn't reach a point of saturation. Don't get me wrong, the DS has a very good chance of making those numbers, but just assuming it will once again sell just as much as last year is a bit presumptuous.
If Nintendo continues to have the same succes with it's casual titles like Brain training and can please the "hardcore" crowd with more games of a quality of Zelda, they have a good change of reaching identical sales or more to last years. The there are still unknown factors that can twist the faith of the ds, a factory burns down, some little kid swallows and chokes on that pen in America and some presidential candidate warns people about it. So many potential factors....
Just flat out assuming something in a fast changing market like the videogame industry opens up the path to a large margin of error.

PSN name: Gazz1979 (feel free to add me, but please put your Vgchartz name in the message!)
Battlefield 2: Gazz1979










