Creating CGI Leia and Grand Moff Tarkin

Below is a video from ABC News that provides a little behind the scenes footage of how Rogue One brought to "life" a young Princess Leia and Peter Cushing's Grand Moff Tarkin. They do somewhat discuss the ethics of creating a dead actor's performance but ultimately the legal issues are "does the family give permission" and unless current actors follow in Robin Williams' footsteps of specifically stipulating in their wills that their likeness cannot be used in such a manner, I suspect this will become more common. Personally I don't have a problem with it as long as done for purpose of story and not just theatrics or attention. In this case, showing how Tarkin took control of the Death Star was fine as was using Leia as connective tissue between the end of Rogue One to A New Hope.