Okay, I just got home from the theater, saw this with my youngest son.
I want to caveat this, I am NOT a Star Wars fan. I have seen all the movies, except Rogue One. I am and will ever after will be a Trekie.
That being said, and the full honesty that I have NOT read this whole thread and don't intend to.
I will also caveat this as I don't know what is and what is not cannon, nor do I care.
All in all, this was a very interesting movie. Some really good and some not so good, which is what to me all the Star Wars movies are.
It is also clear to me, that this is setting a stage for a never ending journey.
The tale to me was what was shown in THIS movie, and the fact it was made clear that the Force needs and forces balance. That simple.
so in the first three(actually the second three.....yeah I know it gets confusing) You had the high council or whatever of the Jedi in control and being the law and order. Thus the forcing of Darth Sidius and the rise of the Dark side. Also the push of Annikan over to dark side, and thus the annihilation of the Jedi caused by Annikan. Then you have Luke and Leia being born, to balance the scales back to the light side, and their victory over Darth Vader and Sidius. Now, the dark side once again gets enforced by Ben Solo becoming the dark leader and so on.
In other words they could keep this back and forth going for ever and ever. Yes, this over simplifies the process, but it is what is the core of the story.
I get the Rogue one idea, as it is a bridge from what is now 3 to what is now 4(but was originally 1).
I get the back stories on Han Solo and now I hear there will be Obi Wan Kenobi as well, to fill in gaps.
The ONLY way I see an end to the back and fourth is ....If Rey and Ben both die, thus breaking the cycle and keeping balance, or they both survive to cancel each other out.
Since that won't happen, as they will want to keep dragging this out...I can pretty much tell you what happens in the last of this trilogy. But then again, if my theory is correct, you know it already.
Its a shame, cause this could be a very nice finality to it, to allow it to end with dignity and not just drag for dollars.
Net, it was a pretty good movie, I have MAJOR issues with Rey having all this power untrained and all the ability to control it. That is a major flaw here.
Just my $0.02