On stage Wednesday at Cannes Lions, Eric Schmidt seemed like the kind of man—perhaps the only man, other than Steve Jobs—who could effortlessly convince an international crowd of 20- and 30-somethings to join a suicide cult and ascend with him to the heavens. Google’s executive chairman has that wealthy California brand of optimism that is as infectious as it is understated. He describes the future of human existence in the same calm way chef Thomas Keller might describe his roast chicken. Yes, it will change your life. But it’s only chicken.