Thanks for linking to this. I think Christopher is entitled to his indignation for what has become of the Middle-Earth tales. This article makes him more 'co-author' than just 'executor', so it's understandable that he feels the misappropriation of his property is a personal injury.
But, the movies are an interpretation of the original work, and not the work itself. Certain things had to be changed to make the stories work as a movie - like adding characters and adjusting timelines. I don't think all of the changes were good, but almost all were necessary.
It is a hope beyond reason that the owners of the stories' rights in Hollywood will show restraint in licensing their product to the highest bidders. They have a simple goal - to make as much money as possible. And we will all have to suffer through the Hobbit menus and Lego figures until this blows over.