Here we come to it: with no disrespect to anyone, I think it is inevitable that movies and associated merchandise can drown out the original text being adapted, or at the very least colour perceptions of it. It is perfectly legitimate to prefer the experience of a movie, a videogame, an action figure etc to a book, and I don't seek to make a judgement on that. But we can hardly blame the Tolkien family for their realisation that the commercial juggernauts that movie adaptations become may threaten to overawe the original stories themselves. That can only more salient when the adaptations in question are of a poor quality, and show little fidelity or sensitivity to the original story and characters.
It's clear that Christopher Tolkien feels himself to be a custodian of his father's stories. As head of the estate, and presumably a trustee, he is. None of us know what conversations occured between JRR and Christopher, or what the former's wishes were. Frankly, I think it is damned disrespectful to call Christopher an "old fart" for his desire to protect the stories that we all love, particularly when The Silmarillion and its associated works would never have been published without his years of hard work.