By next year Weir will have three published novels The Martian, Artemis and Project Hail Mary.
Artemis had its rights bought by Fox and is now owned by Disney and has Lord and Miller attached to direct. Project Hail Mary had its rights bought by MGM and has Ryan Gosling attached to star and produce.
The question is which book will get a movie first, the book currently stuck in Disney limbo or the book that's not even out yet so we don't even know if it's good or not?