Comment: There is a lot more to realism rendering (Score 2) 331
I think main challenge is the interaction between player and environment. On something like MW3 that is limited to blowing up the odd chicken, window or set piece designed into game.
I want to swish my ( virtual ) hand through a river and see ( and feel ) the water flow around it.
Any true physics model would require awesome cpu capacity. We have at one end mindcraft ( where the atoms are decidely blocky ) and second life ( where behavioural programs can be attached to objects).
My dream would be a virtual universe with atoms large enough to fit 1000 times current cpu capacity but behaves like a 'real' experience.
By 'atom' i mean the simplist construct in this universe which satisfies greatest potential complexity but still cpu possible.
In conclusion future 'games' will not be about fps or polygons per sec but model calculations.