As someone who had suffered from an unknown illness (no doctor could figure it out), I can rationalize how such a system would have been helpful. You see a bit of this with WebMD's Symptom Checker, but I feel tools like that aren't comprehensive enough and we end up with a lot of cyberchondria. You can't rely on co-relation to find absolute answers, but helping map out symptoms, lifestyle choices may be a tool to finding solutions faster.

It took about a year to resolve my illness. Going to the doctor 2-4 times a week for 10-20 minutes isn't enough to work with when you have no clear-cut diagnosis.

Now, to be clear, I am not talking about replacing doctors or devaluing doctors by allowing everyone to be an expert.