I am aware of nothing in the physics of the sensor that would cause the image sharpness to degrade preceptably within a decade or so, although you might loose some pixels, etc. You COULD see sharpness degradation from the sensor if the surface became coated with an environmental film (technically refered to as "schmutz"), such as grease, oil or other mists and dusts. It would be like using a nylon scarf to soften an image - or vaseline on a UV filter.
I don't know and couldn't even guess about the relative likelihood of such residue built-up versus focus sensor deterioration. Cleaning such build up would require a delicate hand AND an appropriate, dust-free solvent. Personally, I'd only try it if the camera in question weren't my only camera.
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"do you like it and think this is the best you can do with the subject and location and model and equipment?". - Glenn Usdin
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