So Lucas has apparently made some statements about his ideas for the sequels:
Pretty interesting though I honestly don’t think he would have handled it very well had he made it himself. It’d be cool to see them explore the Whills more in depth in the future, though.
Makes you wonder what those treatments looked like. By now we actually do have a fair share of info from the “Art of” books mainly, with a decent number of elements making it into TFA and TLJ. I’d be somewhat surprised if anything works its way into IX at this point though, it seems like they’re now possibly too far removed from what he conceived. Just another reason to hope for a comprehensive “Making of” book at some point.