Bringing Lucas back would just not work, and at this point, I doubt he'd want to.
Not sure I want Trevorrow either though. Jurassic World was decent, but didn't have a lot of substance. It would be awesome if they could just get a collection of top-tier directors to do just one each, even for the spin offs. I mean, what director wouldn't want their hand at Star Wars? Nolan? Boyle? Jackson? Blomkamp? Del Toro? Whedon?
I suppose they also have to be people willing to succumb to the tone and feel of Star Wars, rather than having their own take, so that may deter some.
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