The Witcher started off as a series of hit books, then became hit video games. It seems the series' success is unstoppable, as the Netflix adaptation is also a bonafide hit. Netflix confirmed as much in an interview in their recent financial report.
"During December, we also launched The Witcher, which is tracking to be our biggest season one TV series ever. Through its first four weeks of release, 76m member households chose to watch this action-packed fantasy, starring Henry Cavill. As a testament to how our hit content can penetrate the global zeitgeist and influence popular culture, the show’s launch drove up sales of The Witcher books and games around the world, and spawned a viral musical hit."