The end of the (ad agency) world as we know it?

As the advertising and media sector adjusts to a landscape without Sir Martin Sorrell as the face of WPP, speculation turns to both the future of the world’s biggest media agency and the repercussions of the ad mogul’s resignation on the wider industry. Pivotal to these discussions is whether the constituent agencies themselves are also outdated. 
But even before the announcement of Sorrell’s departure, the fluctuating fortunes of these organisations have been well documen