Those that care about Star Wars movies have heard a few theories recently like on how Luke might be evil (Seriously hope not, kinda undoes a lot of what was accomplished in the original trilogy if so.) and that Jar Jar was intended to be the big bad guy all along (Yeeeeeah, he was created to sell toys.) so I figured I'd put my own ideas out there.Basically the gist of the theory is that Luke is really the chosen one meant to bring balance to the force. And bringing balance to the force means he brings balance to the force inside himself: That he’s meant to use both the light side of the force and the dark side without being dominated by the dark side.
The Jedi in the Old Republic resisted the dark side completely, and even shunned anything that could possibly lead to being dominated by the dark side. From an early age the Jedi were separated from their families and forbidden from having their own families in order to avoid being too attached to others, they forbidden from feeling anger, and having possessions. But Anakin and Luke were trained as a Jedi later in their lives then normal Jedi.
We see where Anakin failed in not being controlled by the dark side in that his attachment to others led him to join the Sith to try and get the power to save his wife. He let his anger control him and lead him to do evil and be consumed by it. But Anakin had no resistance to the dark side like all the other Jedi in the Republic. He was never taught how to deal with his anger and how to perhaps use it for good, he was taught to never be angry at all.
Luke however succeeded where Anakin had failed. His attachment to his friends may have led him to join Vader to save them, but he resisted that temptation. His big test came when he was able to use his anger to defeat Vader, but he was able to resist being taken by the dark side by throwing away his lightsaber with the Emperor standing there. The reason Luke was able to resist the dark side is because he wanted to save his father, and he wanted to avoid becoming like he had. His attachment to his father is what saved Luke and is what gave him some resistance to the dark side. Note that he only defeated Vader because he used the power given by his own anger. Luke was using a righteous anger, an anger driven by his will to protect his sister. For a normal Jedi, even that would have been enough to send them deep into the dark side with no return, but Luke also wanted to save his enemy, so he was able to show mercy, preventing the the Dark Side from taking hold of him.
So Luke is a force user who is able to control the dark side and use it for good, and not be controlled by it, he is a new type of Jedi. What Yoda said about anger always leading to being controlled by the dark side was correct, for every other Jedi that came before, since all Jedi that came before had no resistance to the dark side, so once they showed any anger it would dominate them, like it had the Sith. But Luke being the true chosen one broke that pattern.
I always think it was necessary for both the old Jedi and Sith orders to be destroyed that way the dark side would not easily control anyone again. Though things could have been done without a massacre by just having the old Jedi order dissolve over time while the new Dark-side resistant Jedi took their place. Though Sideous' actions ended up accomplishing the goal in the end, leading the the end of the old Jedi and the Sith.
I think Darth Plaugueis knew the true meaning of the prophecy, and the true nature of the chosen one, so he took it upon himself to try and fulfill it. Using his power to influence midi-chlorians to create life he created many children with the potential for them or one of their descendants be the chosen one. One of those children was Anakin. Plaugueis wanted the force to be in balance, but his plans were ruined by Sideous who killed his master, and upon finding one of the children that was created he poisoned him to join the Sith. Twisting things in his own plan the destroy the Jedi.
So my basic idea of how it’ll play out in the new films. I think Kylo Ren might be a descendant of another child that Plaugueis created. He thinks he’s the true chosen one, and that balancing the force means Jedi and Sith had to both be destroyed. Vader destroyed the last Sith Lord, so Kylo has to finish what Vader started by killing the last Jedi, Luke. Kylo Ren isn't a Sith, just a force user, maybe even then he'd understand that one he's killed Luke he has to end his own life. As for Luke’s location, he's hiding, since he doesn’t understand his true nature as the chosen one: That he’s supposed to master the dark side and not be controlled by it. Luke thinks that since he did show anger in that fight against Vader that he’s in danger of turning to the dark side and becoming a Sith, so he lives in seclusion. Probably why Vader's helmet is important, through some force thing Kylo can try using it to locate Luke. It probably leads him to Leia instead.
Well, that's what I got. Figured I should post this before the movie actually came out.