Interesting idea but I agree that I don't think people want to deal with that level of real life in while playing this game. Of course if you could turn it off then I don't see the harm for people that want it. If this was done, I think it would have to be imaginary "sim-type" diseases. People who have dealt with diseases in real life will be sensitive to how the game handles the illness and treats it. But if they could get fictional illnesses and have to cure them I could see that.