Considering they seem to have been careful not to retell any stories from the EU (besides when it’s something mentioned in the films, like RO and Solo, where things are done completely differently from the EU), it’s hard to imagine them doing an adaptation of an EU story. But never say never I guess.
Give it time. Think about it; you have a very popular story arc and character - so you have a built in audience for it. You have many fans, including myself, who want to see our OT heroes in their prime again. There are many scenes from those books that I would love to see in live-action (Luke’s fight with the Noghri for instance).
As I said years ago in an earlier thread, a mini-series of a dozen episodes or so would better suit The Thrawn Trilogy then trying to compress it all into 3 films.
We’ll see. I don’t think it’s an impossibility. Certainly something like the Thrawn trilogy must seem tempting, considering the character is now canon. But do they adapt it as close as they can, considering current canon circumstances? Or do they just do a very vague ‘OT heroes vs Thrown’ sort of thing?
For me, I’m kinda with Broom Kid. Not that big a fan of Zahn’s take on the franchise, so I’d hope if they did tackle it, they’d change some things.