Nintendo could cut the Wii to $150/$130/$100 if one or both rival motion-control schemes caught on quickly. That said, Natal is a Fall 2010 release it looks like. So it shouldn't have any impact on the first ten months of 2010. The PS3-Wand doesn't look like it has much hype behind it either...but it is a much closer release. Alot of PS3/360 owners have a Wii as their secondary system...not sure how many will see the need to make their systems motion-enabled.
People are difficult to govern because they have too much knowledge.
When there are more laws, there are more criminals.
- Lao Tzu