1) It is an antiquated industry
2) There has to be a better way to do it with IT
3) My company has the magic solution that will save everyone and make me rich
While it is hard to argue with points #1/2 the real problem is finding viable entry points and building large, growing, sustainable businesses around them. Regulation, government and professional, is a huge reason healthcare is what it is.You can make the best ML algorithm to diagnose and treat disease and doctors will spend decades arguing about why it is unsafe and they should always be the final authority. You won't be able to get a diagnosis and a prescription without them. You might think otherwise, but they have real power in denying you medical choice via setting professional guidelines through medical boards and lobbying politicians who are simply not brave enough to pit themselves against doctor's medical judgement.
It is harder to think of a more counter-productive and self-defeating way to market any healthcare solution then by saying it is going to "replace doctors". Here is a great example (DNA testing) of how doctor lobby can restrict innovation: http://www.nytimes.com/2010/03/20/business/20consumergenebar...
EDIT: I actually believe Vinod Khosla knows better and he just made a troll statement on purpose. It worked, we are talking about it!