I've said it before, and I'll say it again: particularly after the Disney sale, I do not care what George Lucas says or said.
Hell, I didn't care about a lot of what George said after about the mid-'90s. But what matters is what the folks
LFL care about. The fact that they're keeping the Prequels and Clone Wars in the canon shows that they care more about what George thought than I do.

They've shown a desire to "do right" by him and generally respect his [most recent] vision of Star Wars. This includes the fan challenging his generally well-known lack of concern for EU facts by asking him who Luke's wife was, only to receive that answer. So given what we've seen of Luke so far in the TFA stuff, I'm going to presume that's what LFL went with unless and until they show me something different.
The man has been so inconsistent in his statements and what he put on the screen over the years that I don't think he has a true, coherent vision of his own universe. I think the story was a living thing for him, that he changed his mind about periodically, and frankly I don't think he's quite the master storyteller he's been held up as. I think he's a good core idea guy, but he needs other people to rein him in.
That's exactly, almost word for word, what I've been saying for years. Hell, Star Wars and Empire were only as good as they were
because he deferred to others' opinions. Jedi is the first one where he exerted full creative control, and the director and writer ultimately deferred to him.
More to the point, I don't think what George said or thought or even wrote down once on a yellow legal pad is what's best for Star Wars as a story anymore.
Ironically, it's what he wrote down on yellow legal pads back in the early '70s that I think he should have stuck with, barring the most minor of revisions. The more he tweaked, the less organic it's felt.
Fine to generally respect what he did before (as in, not retcon/reboot it -- never mind that the man is infamous for, himself, retconning various points), but beyond a general respect for what already exists....screw what George says. It doesn't mean spit.
Enh... I'd go so far as to say it's fine to re-edit/re-make everything from Jedi on, due to contradictions in those later works to the content of the first two films.

And use as the excuse to retcon "George did it, too." Actually, it could justifiably be called a correction or restoration -- ironing out the contradictions that crept in in Jedi and then charged in in the Prequels, uncompressing the timeline to what it was when the OT was being made, etc.
The man spent his life trying to exert total control over his artistic works, I think, to the point where even good ideas from other people were dismissed because they were from other people. I'm not saying Mara is the best thing from the EU (I don't think she is), but I don't think George wanted or was interested in anyone telling him what to do, even if it was a good idea. He had his own sense of what he wanted (which, again, could change from moment to moment), and he'd be damned if he'd let anyone else suggest he do otherwise.
Given the entirety of the EU (which I've been present for every step as it's unfolded), I think Mara Jade is one of the
better elements... Not always handled right, but then neither were the canon characters always. But yeah, he always reserved the right to overwrite anything in the EU. Frankly, it's kind of amazing that he included Coruscant and Aayla Secura.
--Jonah