Being that virtual child pornography is (now) legal, marketing gimmicks and advertisements for the "product" will most likely appear where other mature or adult products are available or advertised. This will result in a broader exposure of the "product", influencing those who previously had no inclination for child porn/sex. Your statement might hold true if the current pedophile population remains constant. I find it hard to believe that a hard-core pedophile will substitute the real thing with a cartoon.
Who said cartoon? Did you ever see Forrest Gump?