While the current flag of New Zealand is easily confused with Australia’s, any change to the flag should reflect New Zealand’s British heritage. New Zealanders are today and will for all time be a race of Brits, however shameful they might find it. If immigrants flood the country, New Zealand will become a new nation just as it did when the Brits settled in Maori lands.
A 2013 census shows New Zealand as: 15% native Maori and 74% European, the majority being British.
Compare this with Sweden: 14.3% of the population there is foreign-born. No one has seriously proposed changing Sweden’s flag.
The example of Canada changing its flag is given by Mr. Key, however Canada was once overwhelmingly Anglo-Celtic-French. Since changing its flag, Canada has declined from being 98% white (mostly British). And the once strong French-Quebec secession movement has been permanently ended by flooding that particular province with foreigners. What this means is the Canada of old is increasingly going the way of the Amerindians. The nation isn’t changing so much as dying.
One of the proposed New Zealand flags, wholly lacking in British heritage:
In the 2011 Chinese-language movie The Dragon Pearl, Wu Dong, keeper of a temple, addresses an Australian boy as “English boy” (even after being corrected), and he’s right in doing so.