I predict that in the near future, Sophie will be caught. Since David got introduced into the book he seems like the typical little kid who says things that he does not realise at first that could either get him killed or get him into a lot of trouble. For example, I think that eventually he might “Accidently” tell someone about Copies or tell someone that he can read minds. I also think that if he tells someone (Especially his Father) David and Sophie will get sent out into the fringes