Some congregations need a radical transformation. Anything less will be insufficient. Few congregations can engage in a radical transformation without giving authority over to an outside third-party with the wisdom to focus the congregation on effective actions for transformation, and the authority to compel the congregation to act.
Congregations in need of radical transformation have a lot of cultural baggage surrounding the way things have always been. They are resistant to giving up what might be dysfunctional patterns. They need to grant authority to a consultant, an intentional interim pastor, or a new pastor through a negotiated covenant.