Well IMHO, the best way to get a happy ending out of Moulin Rouge is to stop it approx 5 sec after the 20th Century Fox logo at the beginning , eject the DVD and frisbee it across the room so that it smashes into several small pieces against the wall.
I really fucking hate that movie.
aside from that, I don't think Joss (did he write that ep?) had any particular point in mind, it was just a joke, it simply meant that Willow stops it before Kidman dies.
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"It's important to think. It's what seperates us from lentils"