The emotional force of a novel that has the power to grip a reader through many readings spread across multiple decades just cannot be delivered by a 112-minute movie.
On the other side is the force that constructs and connects, that imposes logic on the content, winning the reader's trust, enabling him or her to relate to unfamiliar material.
Since Google put Reader on the clock, the Internet has exploded in anger and despair, with a grassroots force even larger than the one capitalized on by the Veronica Mars movie.