About my MGS4 comment in Japan:
I didn't say that MGS would move 750k systems (after all, like you said, MGS3 only moved ~700k units in Japan). But merely, such a title would help be a deciding factor in giving the PS3 a major, noticable boost to get it upto such sales numbers, in the same way Blue Dragon helped move alot of systems for the 360 in December last year there.
IMO, the PS3 is in the same boat as the 360 in Japan. Neither have great games, and an obstructive price. Once the PS3 has good games, it'll, on average, start moving more and more units, and late-year titles like MGS4 and others will help. Does that mean the PS3 will magically steal thunder from the Wii there? Absolutely not, but it might get a few PS2 owners enough reasons to finally take the plunge and make that Salary Man buy a PS3.
MGS4 could move 100-200k units by itself but again, thats ontop of whatever Nov-Dec would be without MGS4, which would be around 400-550k for 2 months.
Analysis business models: about the comment of the Wii's "revolutionary gaming" abilities with the Wiimote. I agree it has such that are evolutionary to the video game market. However, I think the issue is with the Wii just randomly scoring 100m+ sales this gen, is the fact of competition. If the Wii was facing an already-weak Sony (and not a falling giant), and a Microsoft that never made inroads vs. the PS3, it'd easily kill everything and stay ontop till a succuessor releases. However, this has to be the most heavily invested in generation (both innovation and cash wise), not only by Nintendo, but MS/Sony. The X360 isn't the newcomer Xbox trying to carve out a market. It's already been around, and increasing its total market share from last gen, and is doing a bit better. The PS3 isn't the gamecube, and has no 3rd party support whatsoever.
Remember the Blue Ocean Nintendo is going for. If indeed the Wii is tapping into the DS-Generational gamers, and is getting a new target audience, then it has swam into the Blue Ocean. The Blue Ocean is big, and the Wii is selling to it. However, this doesn't invalidate the fact that the Red ocean is very very large, and although the PS3/360 are fighting over it, there are still probably 100m consoles to be sold merely by former owners that'll probably purchase a console by one of those 2 companies. If that's truely the case, there is certainly alot to fight over. Not only this, it hinders the Wii's ability to achieve strategic dominance, as any system that can sell 40m+ units is certainly a threat to market dominance.