what would of happen in the sequel

Does anybody have a guess what might of happen in the sequel. I always wonder how the trilogy would of turn out. It has so many unexplained answers at the end of the film. Like what would of happen when the mermaid met lily again. What would happen to the child. I just wish they would have made a sequel to this movie. Oh well I guess I will never know what happen. I just want to hear your guys opinion what you think would of happen.