No, GT PSP will get to 4 million easily PSP games tend to have huge legs, just look at how Buzz Quiz Master opened or look at FF7:CC or GoW:CoO legs.
@ Garnett
Define "huge". GT4:P had the Gran Turismo Title on the box art too, but still only sold like 1,5 million. Just like Halo Wars. GT5:P proofs that Gran Turismo is still a 10 million+ franchise, even though many people saying otherwise.
Huge = Alot of people like it and its well recieved
Halo wars is to Halo like Gran turismo is to ModNation.
GT4P? Doesn't exist, And GT 4 Sold what 10 million for a sim, "When has the word sim meant fun?" that means people will buy it.