I wouldn't call wanting a second act ego. It's about contributing and working on interesting problems. Elon, for example, made some money on PayPal but that's not what he really wanted to do. Once you become successful it opens doors. The guys at Google didn't want to be an advertising company, they probably want to just work on Google X all day. Anyway, the Woz already made a dent in the universe. He's certainly entitled to relax if that's what he so chooses.