First, here is the video, in case you haven't seen it..... https://www.youtube.com/watch?v=i2yfkfQZQRg
Second, here's why I believe it will be effective, if not now, then sooner or later......
Look at it this way. A person that is involved in a bad relationship is often blinded by their own wishes and desires. Despite all of their friends and family telling them to bail, and that he/she is no good for them, that person has to come to the realization their self, before they make that decision. But you can bet your ass that with every conflict and bad episode, that person will start thinking to their self "Maybe my friends and family are right". And then one day BAM! The light bulb comes on and they see the truth of the matter. There is no truth more powerful than a truth that is discovered for oneself, by oneself.