Is everyone forgetting that the Xbox 360 has been out a year longer then the PS3?
And if you compare both hardware launches the PS3 is actually 3 million ahead of the Xbox 360.
So once it's the year 2012 and if the Xbox 360 is still ahead of the PS3 (which I dought) then you can admit that the PS3 was "handled" by the X360.
And this doesn't make much sense because your assuming way to many things. Your assuming that Sony is going to end up like they are for this generation in the next generation. Nintendo went for being in last to number one. For all we know it could be turned around again and Sony will be back on top of the console market. And the only reason why the X360 is as cheap as it is, is because once again it's been out for a year longer then both the PS3 and Wii.
One of the main reasons the X360 keeps getting exclusive games is not because Japanese gaming companies want to exclusively makes games for just the X360 because they know it'll be the number one console for the next generation?, it's because Microsoft is paying them to exclusively make a game for there console.
So I'm not saying the next Microsoft console won't be the number one console for the next generation, because anything could happen, but it's just your examples didn't make much sense to me.