Possible? Yes, in principle. It is software. FPS games are software. It could be done. But only a complete idiot would do it. Why engage in a complete rewrite of a ten-year-old game to incorporate entirely new elements that have little to do with the existing simulation, when starting again from scratch would be quicker?
So yes, it would be possible, and no, it isn't going to happen.
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MoBo: Asus Sabertooth X58. CPU: Intel i7 950 Quad Core 3.06Ghz overclocked to 3.80Ghz. RAM: 12 GB Corsair DDR3 (1600).
GPU: XFX 6970 2GB. PSU: 1000W Corsair. SSD: 128 GB. HDD:1 TB SATA 2.
OS: Win 7 Home Premium 64bit. Case: Antec Three Hundred. Monitor: 24" Samsung.
Head tracking: TrackIR 5. Sore neck: See previous. 
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