For three decades, accounting's diversity efforts have rested on a quiet assumption: that marginalized students needed to be prepared for institutions, not that institutions needed to be prepared for them. A synthesis of 81 peer-reviewed studies now challenges that premise directly, revealing that scholarships and mentoring open doors but cannot transform the cultures waiting on the other side. With gender parity still projected 123 years away, the profession faces a reckoning not with its pipeline, but with itself.