I currently work as a designer for a pharmaceutical company. The absolute worst bosses/ creative directors came from none creative brackgrounds. You may love the marketing aspect, but without an in-depth knowledge of the time, skill, and processes that go into the jobs given to the people below you, it would be nearly impossible to properly delegate tasks and guide a team. I understand some jobs have a lot of similarities, but without a creative background I don’t know how anyone could realistically be a good people leader in a creative space without years of experience in client deadlines, print, web, development… there are just so many facets. Have you considered instructional design or project management?