Henry Cavill will not be returning as Geralt of Rivia in the fourth season of Netflix's The Witcher. Despite concerns about the show's success without him, a data report from Netflix suggests that it will still thrive. The report reveals that The Witcher has remained popular since its first season, with a total of 72.2 million hours viewed for season 1, dropping to 59.3 million for season 2, and 33.4 million for season 3. The prequel miniseries, The Witcher: Blood Origin, also garnered 65.3 million hours viewed. 

These numbers indicate that The Witcher has a dedicated audience. While the show's success without Cavill bodes well for season 4, there are still issues that need to be addressed.

To fix these issues, season 4 should focus on including more monsters, developing main characters, and dropping unnecessary subplots. The Witcher's future success hinges on its ability to address these problems.