I'm not sure why more romance novels don't get made into films, especially for women-focused networks like Lifetime and WE. There have been a few movies I've seen and enjoyed that were based on romance novels, such as Another Woman (based on a Margot Dalton Superromance) and Straight From the Heart (based on a Harper Monogram romance by Pamela Wallace). And others I've seen that played out exactly like a category romance might--The Hired Heart, for instance, could easily have been a Harlequin American or maybe even a Superromance.
What I'm wondering is why television and movies haven't realized that Intrigues are tailor-made for the movies? A nice mix of action/mystery and romance, bigger than life heroes, heroines and situations, lots of suspense, romantic tension and great pacing--sounds like just what the viewing audience is asking for more of to me.