
I don't think it is going to happen for a while, unless some sponsor with huge bucks steps in.
Personally, I think there should be a separate museum dedicated the human body and health. The vital organs — brain heart lungs, kidneys, etc could each fill up extensive exhibits. With an aging population, there would be a lot of interest in a place like this, and it would help people understand their own bodies and keep healthy.
Much like the Museum of Civilization runs a separate War Museum, or Science and Tech has the Aviation Museum, the Museum of Nature could easily have separate institutions for Natural History/Science, the Environment, and Human Health.