I thought of the final Clone Wars episodes as well. Maybe, Filoni will be allowed to tackle this subject through Resistance?
Here's the full exert:
Lucas: Everyone hated it when we started talking about midichlorians in The Phantom Menace. A whole aspect of this film is about symbiotic relationships. It’s about recognizing that we’re not the boss. There is a whole ecosystem there.
Cameron: There’s a whole ecosystem called microbiome inside that we’ve just started getting to know.
Lucas: The next three Star Wars films] were going to get into a microbiotic world. But there’s this world of creatures that operate differently than we do. I call them the Whills. And the Whills are the ones who actually control the universe. They feed off the Force.
Cameron: You were creating a religion, George.
Lucas: Back then, I used to say it means we’re just the cars, the vehicles of the Whills they’re traveling around with. We are the vessels of Whills. And the connection is via the midi-chlorians. The midi-chlorians are the ones who communicate with the Whills. The Whills, in the general sense, are the Force.
Cameron: But in fact you’re just drawing a surface, a facade of science around an idea that is timeless, namely, the mind, the soul, the sky, the cause of all being. In your world, you’re accessing the basic archetype, the mind, a deity, and all that.
Lucas: I worked this whole concept with the Force, the Jedi, and everything from beginning to end. I just never had the chance to finish it and tell people about it.
Cameron: It’s a creation myth, and without a creation myth you can not build a world. Every religion, every mythology is based on it.
Lucas: If I’d held on to the company, I could have done it, and then it would have been done. Of course a lot of fans would have hated it, just like they did Phantom Menace and everything, but at least the whole story from beginning to end would have been told.
Based on Lucas' general comment, it's hard to tell how much of the film would take place "microbiotically" or how the human protagonists would interact with this world.
I'm not sure of philosophic significance either. What do the Whills get out of their machinations? Do they literally control everything in the GFFA? Does this mean that the true enemy is the Force itself? Is Anakin a conceptualized device of the Whills or an unforeseen aberration? Is Force-Ghost Anakin the only hope for destroying the Whills control?
I have 100 questions - all of which are much more intriguing than wondering about Rey's parents, whether Poe will become a true leader, whether Finn and Rose end-up together, whether Kylo finds justice and/or peace of mind, etc. I'm interested in those questions too. But, Lucas' comments have got my brain on fire in the classic Star Wars sense much more than anything Disney has originated.
That being said, I have new found sympathy for Igor and Kennedy. I realize that it's not easy to turn-out a profitable general audience-pleaser based on a microbiotic premise.
I do wish they had the nerve to try. Is Arndt's episode 7 script based on Lucas' vision?
After Solo's disappointment, there will probably never be a Star Wars movie with this high-minded a concept.