The situation is a lot more complicated than many of the people here seem to realize or want to admit. For example Nintendo is extremely strong on their own platform and that is a cause for concern among third parties.
For example read the following article to see what I'm trying to get at:
http://www.gamesindustry.biz/content_page.php?aid=28438
Also things are very different from last generation when the three consoles were relatively close in power compared to the current consoles and also the fact that the two highend consoles this generation are seeing some kind of merging with the PC market with many games coming out for all three platforms in relatively short periods of time. It's slowly becoming harder to make multi-platform games as the expectations on all three consoles changes.
And finally while the marketshare for the Wii is obviously going to be high, especially for the next two years, as prices come down for both the 360 and PS3 they will keep coming into the reach of more and more consumers until they eventually reach the mass market price points where all consumers are finally able to consider their consoles and they're finally able to compete for the same consumers as Nintendo.







