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just looking at texture color bit depth is a simplification of the issue with regards to DISPLAY color bit depth. texture color bit depth is only one factor in determining what the maxium required colors are/should be once all of the pixels have been processed through the rendering pipeline. you also have to consider source lighting, reflection, refraction, emission (eels!), alpha blending, etc.
the SSA uses a very controlled lighting model so a 16 bit color depth for DISPLAY purposes works fine. if a more dynamic model is required in later SS's I imagine a deeper DISPLAY bit depth would/could add much more realism to the scene, regardless of the texture color bit depth.
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