Jim Molan stated that if you think that was an invasion, you haven't seen a real invasion.
It was always going to happen.
Its worth noting that of the Imperial powers at the time, Britain was the only one to have abolished slavery. The rest of them, including the Maori, didn't get around to stopping the practice till the mid-1800's.
Future historians will view this time as part of a long transition of a people from the Iron Age, being brought to modernity. Some things will go right, others will not.
One thing is for certain. Living in a remote community where there are no jobs or an inclination to send your kids to school, is a sure-fire way to eventual extinction.