Evolution isn't like that. If there's a body part a creature never uses (e.g. Our small toe), it shrinks and vanishes. If there's a body part a creature needs, it will eventually grow. If there's a body-part a creature uses allot, it will become bigger or stronger.
Personally, in the future, I think we're going to be a race that can breathe under-water, has only 8 fingers and 8 toes and very good eye-sight.
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