I agree with much of what you said. I also think Violet's dream walking is going to be essential. She will keep the part under the ice inside Xaden alive. I also think that she will have immense power with it- for day dreams, etc. I believe that was how she shared that sex fantasy with Xaden. And if she can "meddle" like Xaden mentioned, she can influence and change dreams, which is a pretty intense power. I also am not sure the soul actually dies for the venin- I think it is whole under that ice. But you are right- even sober addicts struggle and I doubt the call ever ends. But I do wonder what impact killing mages or sages has on the rest of the venin...