There is a lot of unknowns - At the moment you're working somewhere which is easily considered one of the best places in the world to work, maybe you feel diffe

There is a lot of unknowns - At the moment you're working somewhere which is easily considered one of the best places in the world to work, maybe you feel different, but the global perception and aurora will likely still influence you in some way. Not only are you considering leaving this, but it would be to stat up a new any untested company which you are ultimately responsible for. I'm not saying your job at Google is 'easy', however it's clearly going to be an easier and more comfortable paycheck. Following what others have said, you should probably come up with your startup idea, and try validate with some kind of MVP before taking the plunge and leaving.