The last three times I've contacted Kaiser (In California) to get a doctors appointment, (Once, when I had stabbing chest pains and my left arm had gone completely numb - I seriously thought I was having a heart attack) - their expert system (staffed by a human, still - but that will change) - asked me a series of questions, and came to the conclusion that I didn't really need to see a doctor. "Drink some tea with honey for a cough", "Stretch your arm, and take breaks from the keyboard" for the numb arm. Oh, and "Stress Pains"

So - some significant number of doctors are already starting to be replaced by the experts systems at Kaiser right now.