Hey

No skill get wasted until you apply that to real world applications. Digital Marketing is a demanded skill in this tech driven world where management and IT firms tend to use Digital Marketing for publicity and better reach at it's peak.

Doing a D. Marketing course will definitely help you in your MBA in some or the other way, though it is not a part of MBA curriculum but you can use it in your internships, projects and case studies. Also one could apply for jobs in Digital Marketing domain if he/she has well developed skills and experience in the same field.

For further doubts, ask us. All the best