1/2 million is much more reasonable goal right now. Frankly, that's still impressive.
As for PSP sales, there simply isn't a game out there that tells people to go buy it. Take Nintendogs or Brain Age for example. People who had zero interest picked up a DS because they heard of those games.
GoW doesn't have that kind of pull. At the end of the day, it's an action game. A totally fantastic action game but an action game nonetheless. It won't bring in new blood required to boost hardware sales.
If you want a game to boost PSP sales it really needs to think outside the box AND appeal to those outside the PSP crowd AND get heavy advertising. GoW has exactly one of these factors, good advertising.
There is no such thing as a console war. This is the first step to game design.
