To me the logical endpoint is to have hand-crafted faces for characters. Instead of just having an actor use their own face, they have a face created by the art department superimposed on them through this process. For example, instead of Harry Potter looking like Daniel Radcliffe, his face would be something carefully designed by a committee referencing the books’ illustrations and drawing up concept art before coming up with the finished product. That way you don’t have to question the ethics of resurrecting dead actors, and if an actor just can’t be bothered with another sequel, they can easily be replaced.