Ok to those who were saying I was wrong about Japanese games selling PS3s here, here is the deal:
Ratchet, Uncharted, and Killzone won't do shit to bring the PS3 ahead of the 360, they won't move a lot of systems to begin with, that's for sure.
There are currently a LOT of PS2-only owners that have yet to buy a PS3 (like me). Why? Because the games they like have been on PS2 and PSP only, and the ones to come on PS3 are too far from release yet.
To name a few:
Ace Combat
Resident Evil
Devil May Cry
Final Fantasy
Metal Gear Solid
Grand Turismo
A bunch of random RPGs like Nippon Ichi's, etc.
Some Dynasty Warrior games.
Shadow of the Colossus-like game
And more.
Basically, the PS3 doesn't feel like a successor to the PS2 when you look at its current lineup or its soon-to-be-released games, so a strong part of its hardcore userbase hasn't made the jump to PS3, and as the time passes the 360 is starting to look more and more like the PS2's successor lineup-wise (with many of the above to be released on it, add to this Dead Rising and Lost Planet, Blue Dragon, Lost Odyssey, etc.).
So yes, if the PS3 had a much more Japan-oriented lineup with former PS2 big-names being released for it now, exclusively in at least a few cases, it would have made a huge difference. The camp would have remained divided as they were last gen, with the MS brand being mostly Western/PC games and the PS brand with mostly Japanese games (then add sports games to both consoles).
Sony made a huge mistake by not trying to keep at least the Japanese exclusives for its console.
I can't imagine how awful it will do this holiday compared to the 360/Wii, they have NOTHING for it.