One of the concurrent arguments in this industry, aside from whether the discipline is dead or not, revolves around what skills are essential for a “real” SEO. My opinion is that SEO has returned to being a technical expertise. Practitioners need to move beyond core (on-page) SEO into an increasing number of specialist areas, such as mobile SEO, local, multilingual, analytics/tracking and migration.
The skillset for content marketers are quite different in my opinion; relationship bulding, content strategy and successful distribution techniques. While they should be informed from other disciplines, such as SEO, PR or Social Media, they are more marketer than engineer.
Code above from The Guardian website and was the inspiration for this post.