Great idea. It is actually something that is starting to emerge in the UK too. A really good example is a company call Babylon Health (http://www.babylonhealth.com/). It is based on a monthly subscription fee which is about £5 (~$8) which makes it really affordable. Not sure if they have plans for the US but I know they are keen to go international.
Good luck with the idea. I hope it goes far and builds on the great examples out there.