>> More realistic physics and AI!
>
>  If you tune down the physics and AI because the CPU is not fast enough
> to calculate them, you will be drastically changing gameplay. It would not
> be just a cosmetic change. I have never heard of any game doing that

Sure, but don't you think the minimum system requirements for CPUs in games 
will continue to increase?  Game developers are not going to be satisfied to 
just stick with what they have at the moment.

>  Thus after a certain point, when your current CPU can calculate the
> physics and AI just fine, adding more cores won't change anything.

I can't even begin to imagine any point where a CPU will be able to 
calculate physics perfectly without cutting any corners.  Every increase in 
CPU speed will result in more realistic and believable physics with fewer 
short-cuts.  For starters you need non-ridid bodies for large objects, 
realistically deformable terrain and better collisions.  They all need more 
CPU cycles.

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