I've only seen the films, still, but I always thought that there was no way Harry would get paired with Hermione on symbolic grounds. Sort of Buffy-Xander-Willow - Hermione is intellect, Ron is emotion and if Harry ends up paired with one of them romantically it throws him off balance. And since I don't think JKR would dare have a bisexual three-way relationship as the happy ending of her series...