I don't think that Slaughterhouse-Five was successful movie material. In fact, Vonnegut's books mostly I don't feel are movie material.
“But in view of the constitution, in the eye of the law, there is in this country no superior, dominant, ruling class of citizens. There is no caste here.”
“Even though it has been very painful, lots of opportunities have come forward journalistically. Once all of this blows over, I think it might actually help that I have gotten this attention.”