I respectfully disagree. Heir to the Empire is almost entirely from the perspective of the new Empire and Luke being abandoned alone on a dangerous mission. He never gathers a crew nor ends up on the Chimera (Thrawn's flagship) to rescue anyone. The New Empire doesn't even rely on Superweapons but rather on secrecy and superior maneuvering. The New Republic only wins because of dumb luck (Leia not being discovered by Thrawn and his misinterpretation when he finds out she was there) and because Luke saves another super powerful force user who may or may not be more powerful than himself.
The Thrawn Trilogy had an entirely different tone with large space battles and technology its biggest ties to even being a Star Wars series.
While I would love for them to be adapted as the New Trilogy, IMHO Disney has made it clear that the sort of exposition and characterization from Zahn's writing would be far too complex for their far more polarized view of character and story.
I'd argue that many people who know the story would be unhappy with the adaption or say that Disney is just making money of Zahn's works because their story team can't come up with something of their own or whatever. The Thrawn Trillogy just wouldn't be good start for this new generation of Star Wars movies.
Maybe we'll see a movie about it if Legends Nostalgia becomes profitable ¯\_(ツ)_/¯
- LucyTheAlien likes this