The book 'Inbound Marketing, Revised and Updated' by Brian Halligan and Dharmesh Shah emphasizes the necessity of a new breed of digital marketers who can effectively attract, engage, and delight customers online. It introduces the D-A-R-C criteria for hiring, which focuses on recruiting digital citizens, individuals with analytical skills, those with a strong web reach, and creative content creators. Companies must adapt by hiring marketers who are engaged and knowledgeable about digital marketing trends, or risk losing their competitive edge.