An article on Advertising Age argues that in our digital world the role of  the brand manager changes:

"Managing a brand has always been a slightly odd concept, given that consumers are the real arbiters of brand meaning, and it's become increasingly outmoded in today's two-way world. That's why a new report is going to recommend changing the name "brand manager" to "brand advocate," and fundamentally changing marketer organizations in response to the onset of the digital age. "

Read the article here.