I wasn't really saying I preferred one or another as far as Luke having a biological son or not. The problem is two fold: a)On the one hand, you can make Luke celibate. Therefore, making him the last of the Skywalkers. That can kinda make sense if episode 7-9 is indeed the last of the Skywalker arc(I think it is). But, you have no one carrying the name which every trilogy has always had some representation of the name Skywalker. It kinda defies the "symmetry" aspect. But this scenario is certainly the easiest to write off the bat. Han/Leia union is already established in the original trilogy for likely offspring. But I don't think people will be too happy that there is no Skywalker character in the ensemble of new characters. b)Luke has a child. But then you have a pesky problem of explaining of who the mother is, a character we haven't met. One way you can handle it is by having her being deceased by the time of episode 7. A writer would have to be VERY careful on how they approach this scenario. You can't just simply just do some exposition dialogue. Her presence will have to be felt for her to have any real meaning(even though we wouldn't have gotten to meet her). You could show significant personality problems with Luke losing his wife. Perhaps a strained relationship between Luke and his child etc over her. The other approach is that she is alive. But then you run into an issue because you have very small amount of screen time that you can devote to establishing this character. Honestly, I can't see how you could give her any more screen time than Aunt Beru. Those establishing scenes would have to be very economical as well as effective to at least give her passive acceptance from the audience. Then the question is: What the hell do you do with her? Personally, I think if you are going to keep her around she has to have an impact on the character of Luke. What I means is perhaps if Luke found love between episodes 6-7, he didn't want to be a Jedi Knight anymore. Perhaps when we met Luke in episode 7, he has retired his lightsaber and went back to being a farmer. I think, overall, its kinda "damned if you do, damned if you don't" scenario.