Objectives need to be quantified and eventually graphed over time. People need to know when ecosystem management is being done. There must be evidence, recognizable. Reducing the deficit, the difference between the actual and the desired system performance is the manager's job. I've only mentioned costs.
Management is expensive.
Every cost is not direct, a payment. There are externalities. This is because most of us work in the public arena. We do not sit on the knife-edge of the daily payroll, nearly consumed by thoughts about costs. In public agency management, the source-field of the ecosystem management concept, the pattern is maximizing a budget, not in achieving system effectiveness at lowest cost.