A study of New Zealand's emergency management organization and system was commissioned and the report is in. See NZ needs a new emergency agency: report.
As you read the above article, I think you will find that some of the findings also fit our United States emergency management system. We too are a patch-work quilt of agencies with differing capabilities at the state and local levels.
It sounds like they would like to move beyond "coordination" to more of a "command and control" model with much more emphasis on federal control and "go teams" to shore up substandard operations for events.
Having watched many a report waste away pending legislative action, we'll have to see what happens with this report.