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"And now there have been novels about the events after Episode VI, which isn't at all what I would have done with it. The Star Wars story is really the tragedy of Darth Vader. That is the story. Once Vader dies, he doesn't come back to life, the Emperor doesn't get cloned and Luke doesn't get married."
~ George Lucas,Total Film Magazine Interview, 2008
https://ibb.co/x5q1RrQ
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"I get asked all the time, 'What happens after "Return of the Jedi"?,' and there really is no answer for that," he said. "The movies were the story of Anakin Skywalker and Luke Skywalker, and when Luke saves the galaxy and redeems his father, that's where that story ends.""
~ George Lucas, Flannelled One, May 2008, "George Lucas: 'Star Wars' won't go beyond Darth Vader", interview with Los Angeles Times
Star Wars Insider 108, 2009
Full Page - https://ibb.co/7tBy5VK
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"Mara Jade is an outstanding character, and we here at Insider thank Timothy
Zahn everyday for creating her.However, stories from the Expanded Universe books are not part of the canon of the films and therefore it is doubtful she'll make an appearance. Having said that, we'd love to see Ms.Jade inserted in Return of the Jedi."
~ Star Wars Insider 79, Page 7.
https://ibb.co/ZWBXWbN
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“Well in George, George couldn’t stand Mara Jade, well he just couldn’t stand, couldn’t deal and they went out and got some sort of person who looked like she’d stepped out of a Cosmopolitan to be the model Mara and he just thought the whole thing was so not Star Wars and not his vision of Star Wars and once, I forget, I think Sue Rostoni between the novels told me or anyway told me they were killing off Mara Jade and I said ‘Do I get to tell George?'”
~ J.W.Rinzler,Author and Editor for Lucas Licensing/Lucasbooks
Interview for SWNN's "The Resistance Broadcast"
http://starwarshub.net/2019/02/01/according-to-author-j-w-rinzler-george-lucas-couldnt-stand-the-character-of-mara-jade/
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"There's this notion that everything changed when everything became Legends. And I can see why people think that. But, you know, having worked with George I can tell you that it was always very clear -- and he made it very clear -- that the films and the TV shows were the only things that he considered Canon. That was it."
Dave Filoni interview on 'The Star Wars show' [41.40 mark]-
https://youtu.be/hcNXPNXOv2A?t=2500