Sony has never launched a Playstation slim edition less than four years after the launch of the console itself. Doing so would be a sign of desperation and weak sales.
If Sony did it, they would most certainly outsell the Xbox 360 for some time. But in this industry, there is such a thing as blowing your wad too early. If you dont completely annihilate the market (see PS1 and PS2), using your sales-boosting tools just means you dont have them later, and your console will fall by the wayside.
This side of E3, it appears Nintendo have blown their sales-spurring games way to early, but they have held off on price cuts and colours to ensure they have more tools later on. Sony on the other hand have tried price cuts (so desperately that they removed features to manage it), colours, bundles galore and they still cant come in anywhere other than third. And this with all but two of their biggest games already out (GT5, FFXIII) and one of them is now multiplatform.
Microsoft have more scope to cut price, just as much ability to create a slim and vary colours, and just as many big games in the pipeline. So will a PS3 slim offer a temporary boost in sales and reversal of the HD console's places? Sure. Will it alter the console war in any way? No.
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