Depression in Millennials

This Washington Post article entitled "Why are so many millennials depressed? A therapist points the finger at Mom and Dad" discusses the increase in depression rates among the "millennial" generation (the demographic cohort following Generation X). Psychologists speculate that the reason is that these children are over-parented, and were never taught the conflict negotiation and critical thinking skills needed to be independent. Does this seem like an accurate assessment? What other factors might be at play?