You do understand that Card doesn't own the film rights to the property, correct? He sold his portion of them to Warner Bros over 10 years ago, who in turn sold them to Odd Lot, who in turn sold the majority to Summit who is financing the movie. Any royalties he receives would be trivial, he's been stinking rich for decades. Easily worth more than any of the actors involved save Harrison Ford. Does anyone think this would actually hurt Card financially?
It comes down to this: Are you willing to hurt thousands of people in an effort to try and bruise one person?