Does everyone writing a novel believe their novel would be a good film? Do you think it's because we've spent so long with our novel we can see it, scene by scene?
Every writer I know thinks everything they've written is filmable, yet clearly other people don't always think that. I've read work by a few friends that I think would work well as a film, but I've read others (usually ones that I think don't work as books either) that I think wouldn't, yet all of them think their work could/should be filmed.
What about you? Do you think your novel would make a good film?