Not my experience, rather the Maori seem to becoming more tattooed of recent times, perhaps as their culture finds a renascence in NZ and internationally.
What is changing is that the ritual nature of tattoo is becoming much less predominant, and that tattoo is being promulgated as more of a secular art form for both Maori and Pakeha.
The other difference I see is that the traditional Ta Moko is as much a scarification as it is a tattoo:
Whereas the modern form is probably significantly less of an ordeal to obtain.