Mhhh, I don't get how you think these techniques should be used in gaming. You're confusing the principle here: it's exactly the other way round I believe.
In real life you don't want to have a greenscreen in front of your nose. What sense would that make? None. The real actors can't see the scene. It doesn't serve any purpose in gaming.
Let's assume you replace gaming with "simulation" (as in simulating a virtual world) then you can simply see that what they do is USE gaming - they use a greenscreen and then virtually replace that with virtual content.
There is one exception. Augmented reality. This IS being done but slowly introduced. The issues are that the world is not a greenscreen so you need a tremendous amount of cpu power to calculate the new virtual space onto the real space. That aside there is only limited use though as you need to make sure that the human does not endanger himself by overlapping reality experiments. E.g. car racing in the real world and seeing digital pictures and images. Could work but would be highly risky.
As for air combat this stuff is old already. Virtual target shooting is being done so there's that. But then again - gaming is enabling sandbox experience WITHOUT real world requirements.You fly a plane in a game means you don't crash, die, need to pay fuel etc.
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