Definitely a worthwhile question Flyby but I think the answer is going to be complicated.
PhysX hasn't made allot of waves recently after their initial outing. Yes accelerated and dedicated physics hardware is nice but there really aren't any mature APIs for it like there are for 3D graphics. Once upon a time it was identical for 3D accelerated graphics.
It'll probably need to be a DirectX component for physics acceleration and some agreed to standards before it really hits the mainstream. With nVidia and ATI/AMD working on competing but similar products no doubt some standardization will come into effect sooner or later.
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