Yeah, she's obviously referring to a lack of pre-existing sources for adaptation, not a lack of pre-existing tie-in media.
But that's still just plain incorrect. How many pre-
ANH Han Solo books were there to adapt? Choosing to make a new story for their
Solo movie was an entirely legitimate choice, but it doesn't change the fact there were other options. How many X-Wing novels are out there that can still be adapted with changes on par with changes the MCU makes to the story arcs they take inspiration from? How many Old Republic novels/comics/games, or other stories set generations or centuries before the PT, and therefore not obviously incompatible with Disney canon the way the Thrawn Trilogy is? And even elements of the Thrawn Trilogy could still fit into the gap between
RotJ and
TFA, if they wanted to make such a film. I'm not saying they
should; I'm just saying they have such resources.
Look at the other comparable franchises of the last few decades: Marvel, Game of Thrones, The Walking Dead, Hunger Games, Harry Potter, Lord of the Rings, etc. etc. The vast majority of them based of pre-existing materials; typically literature or graphic novels.
And
my point is,
Rogue One and
Solo are so heavily based upon
ANH they're barely original stories at all, and that
TFA and
TLJ remake
ANH and
ESB to such a degree they're pretty much adaptations of decades-old source material themselves, just as much as
The Walking Dead is an adaptation of the comic books.
I'll give Lucasfilm credit for making a creatively unique and new
Star Wars movie if they make one that isn't hugely dependent upon a prior
SW movie. Say, a
Doctor Aphra flick, though that would likely be as much an adaptation of comic source material as MCU movies are. But, until they do, trying to elicit sympathy by claiming there's no source material to draw from is a bit rich, is all I'm saying.
