The worry of those who promote and teach about kink is that those reading Fifty Shades Of Grey will dive into recreating the relationships within it. Relationships that if they were taking place in real life wouldn't be viewed as kinky, fun and romantic, but as abusive, emotionally if not physically. Fortunately there are those more than willing to correct the inaccuracies in the book for those looking to discover the real world of BDSM.
I don't believe any single person can say what women want, but I can say with certainty that women do want. And the sooner society, media and business realize that this is the case, that men aren't the only sexual beings, the sooner we'll have greater variety to choose from and representations that reflect us.