Woz is one of the most selfless people I've ever met. At a conference he keynoted for (SynBioBeta), he said that even if immortality were available to him, he wouldn't want to live forever, because he'd be taking up a spot in the Earth's population carrying capacity, and even if that's just one spot of many billions, he wouldn't feel right taking up that spot, when he's already lived his life and now it's time for so…
It is like people can't look away and look at billions upon billions of galaxies clusters and could only see the limits of the Earth. The Earth is finite! we can't grow exponentially forever!