Ummm
I don't think so. Most Americans can't even get into a British or Canadian mindset (think about the current debates on health care, gun ownership, and the death penalty).
How are the Pentagon (not exactly the most open-minded of Americans) going to effectively simulate Muslims, Africans, Arabs, South-east Asians, etc. Let alone the smaller but still very significant differences between (say) Afghans, Pakistanis, Iranians, Uzbekis and Kazakhs. And then You have to simulate the different tribes / communities in these countries, plus differences due to city / town / village / farm upbringing, and education, religious background, nationalism / tribalism, and so on.
It's a great idea, and it would be fine if it worked. I just worry about the military mind's tendency to depend on an intelligence analysis (or in this case a computer) predicting what the 'emeny' (and for that matter what the local 'friendlies') will do, based on a very incomplete understanding of the people involved.
People were surprised what Hitler did, even though they read his books. Nobody thought Vietnam would be the quagmire it was, nor Afghanistan nor Iraq.
He/she who does not learn from history is bound to repeat it...