True. I think that could be a route one could take for a “Revenge of the Jedi” alternate history-style edit of the film.
Yeah, it was unfulfilled. They never really address this idea directly in the new films, but since Leia never came to terms with Vader being her father like Luke did, I think her son now basically being the new Vader is a continuation of that idea. It seems Leia never really forgave her father for what he did, like Luke did. Now, in a twisted stroke of irony, her own child has become her father, and she has to deal with those feelings of anger and forgiveness.