I feel the use of this word as it pertains to Star Wars needs some clarification.
As @@Ping rightly pointed out in our private discussion, according to the Oxford Dictionary "canon" is:
Now, two things strike me here. First, "works of a particular author or artist that are recognized as genuine".
Companies may own copyright, but they are not authors of a work. People are authors with author's rights. In the case of the original Star Wars trilogy, the title of an "author" seems to more or less legitimately fall to George Lucas, as far as the story of Star Wars is concerned.
ANH - George Lucas
ESB - Leigh Brackett, Lawrence Kasdan, George Lucas
ROJ - Lawrence Kasdan, George Lucas
In all three original trilogy movies, Lucas played a key role in shaping the story.
Let me put that in contrast with the new, Disney films to draw a picture:
TFA - Lawrence Kasdan, J.J. Abrams, Michael Arndt
Ep8 - Rian Johnson?
RO - Chris Weitz, John Knoll, Gary Whitta
So it is clear that "canon" in this definition of the word does not apply here.
Next, let's examine the second potential meaning of the word that can be relevant here: "list of works considered to be permanently established as being of the highest quality."
Perhaps Disney meant "canon" as in the stories that are of the highest quality? If so, isn't it presumptuous to suppose that the company alone can decide what is highest quality, and not rely on the fans to decide what they like best to call something "Star Wars canon"?
Or is it that they mean it in the general sense, as a "general law, rule, or principle" by which fans are meant to abide by?
Whatever the case may be, I think it is safe to say that Star Wars "canon" to us, fans, could no longer possibly mean anything other than "approved by Disney". It is certainly not the meaning of the word that pertains to the author's vision, as there is no one author, not anymore.
Perhaps it is best to refer to our official Star Wars history as just that, our official Star Wars history. And in that case, if you ask me, this wouldn't be the shallow spectrum that Disney has inconsiderately and/or inaccurately (perhaps somewhat arrogantly) proclaimed "canon", but the Star Wars stories we, as a communal fan-base have grown up with and grown to love and respect over the years.
This is not to say that new stories cannot become a part of that history. In order to do so, they must impress us, inspire us, and stay with us for many-many years to come. If they are to overwrite old stories, they must do so to be better. Something doesn't just become official Star Wars history because the company that owns the franchise wills it and labels it so. Star Wars history is what we, as the majority of fans, together, recognise as official Star Wars history.
Yes, that includes Knights of the Old Republic as well (even if KOTOR was never officially "canon"). Whatever Star Wars story has touched the hearts of most, and left an impression is true Star Wars history. This is the history that we rely on when we role-play, when we write fan-fiction, or even when we battle it out in a video game -- when we share our experiences and knowledge of Star Wars with each other.
If the new movies are worth anything, they will stay with us, and join this history. If they are not, they will be forgotten as the flops they were.
After feeling bitter about this for many months, I think I may have finally found my peace with Disney's Star Wars, and I hope these thoughts help ease the conflict within all of us, and, perhaps, among each other we all have in regards to different views and feelings about Lucas' handover to Disney, and new direction they've taken with the franchise whose stories and media we've grown to love.
So keep in mind: "canon" is not the right word anymore, and it's really not worth to debate over. It means something else entirely now than what it used to while Lucas still had some vague control over Star Wars stories. "Canon" stands now for Disney produced stuff. What we actually value is our official Star Wars history, and that is something that emerges over the filter of time, as that which is quality stays with us. We, as a greater community, select that with the stories and content where our hearts lie. No single company decision can change or alter that.
They may eventually win our hearts over, but they're gonna have to do a bloody good job storytelling. And if they do so, it will be well deserved. Until then, and forever, Star Wars history is all that we as a community, together, have grown to love and respect in the franchise.