The scenario of Wii sales decreasing gradually over the next year and the other consoles overtaking it has pretty much left the realm of possibility by now. It would require a total reversal in sales trends, and be totally different to how the market works. The only even remotely likely course of events in which the Xbox 360 or PS3 would sell more units is if Nintendo for some reason decides to release a new console that is not counted as a new version of the Wii too soon and kills their own sales. The astonishing profits that they've been making lately might drive them to do something stupid, or focus too much on a single segment of the market. It's also difficult to estimate how the increase in HDTV adoption rates is going to affect the console market, but I don't expect it to be too drastic.
The Wii has several top notch "hardcore" games coming out in the next 6 months, but aside from those we don't really know what'll be released in 2008. Another software drought like the one we had earlier this year is also one of the negative scenarios I can think of, but it's not like we have a great amount of names for 2008 titles for the other platforms either. Besides, most of the kickass 2007 games are 2008 for Europe. =P







