I don’t think George settled on how episodes there’d be until the Prequels. The Sequels seem like an afterthought to keep Lucasfilm busy and successful, and appealing for the Disney buyout. I don’t think he was all that invested in them.
I agree. I do think that George Lucas, in some ways, was just going to sit on the franchise and not do anything with the saga. I know that there were still other projects occurring like the TV shows, but I don’t think we were ever going to get anymore movies after the Revenge of the Sith. I believe we are blessed that Disney is making Episodes VII, VIII, and IX, as well as more movies to come in the future, as this is something they know is important to people, yet it is still very successful.