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. The quality of the series has been in decline, with season 2 receiving criticism for creative decisions. The prequel miniseries also failed to impress. 

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.