The building blocks are already there, with former Walking Dead showrunner Glen Mazzara recently announced as the man who’ll help bring The Tower to TV.
With the reviews for The Dark Tower already faulting the film for being light on the mythology that drove Stephen King’s book series, the long-form strategy of a TV series would serve as a fantastic foundation for future stories in this world.
Not to mention, the specific source material the show will draw on are both Wizards and Glass and The Gunslinger, as the story of Roland’s youth and progression as a Gunslinger are told through these Stephen King novels.