@dougbMy take on Island Mine is that Waylon, being a human being (and therefore a social animal) will need human contact and interaction. How, and on what terms, would he be able to make that happen? And how would governments feel about that if they were to find out?
As to Human Man, the material at the very end of the book indicates that Scott may not have lost his powers at all; perhaps he just can't consciously access them anymore. Couple that with a likely wedding and Janie moving in to Scott's apartment (and likely resuming college there), who knows what might happen. Frankly, Scott not getting encouraged to serve his community in some capacity by his adult friends, seems a waste. I could see him becoming involved in governance in some capacity, while at the same time hating the politics of it (or at least having to deal with politics).
By the way, the best definition I have ever found for politics is, "the pursuit or exercise of power with respect to matters of governance."