I'm going to just compare consoles here...
I think the Wii will definitely pass up the ps2's numbers by the end of this gen, and possibly the ps3 as well. The gaming market is drastically increasing in size this generation, from the large numbers of non-gamers and causals being brought in by the Wii/DS, and because of the rebirth of gaming amongst home theater enthusiasts thanks to the ps3's Blu-Ray player (albeit the latter is a much smaller crowd than the former). Because of this, all the consoles will sell very well compared to generations past.
The Wii will easily pass the 130 mil. mark this generation, and the ps3 will sell at least 80 mil., if not also reaching 130 mil. like the Wii. Of course, the Wii will always maintain a considerable lead over the ps3.
