At Tom Selleck’s California ranch, atop its highest hill, the panoramic view is a testament to his enduring legacy. For 14 years, he’s led the NYPD on CBS’s “Blue Bloods,” but rumors of its end stir dissent, especially from Selleck himself. Despite consistently high ratings and a committed cast, the show’s future remains uncertain. This defiance isn’t new for Selleck, who, before his iconic roles, was an athlete at USC and a face in advertising.