I think that it is a leap to say that Adolin will end up being a traitor. His story is fascinating in that in contrast to so many damaged, ineffective or broken characters he is someone who is relatively well off and yet stumbles. He can very well serve as a study of what it means to be human. Yeah as others have said he seems to suffer less, but at the same time those who suffer too much are not humans. They are caricatures who propel the story, but allow very little in the way of introspection. Instead of saying that he is doomed to turn on everyone perhaps we can wait and see what mirror he may provide for the readers.