No language lasts forever. Trying to make people learn a language they are not interested in learning and don't think is relevant, is a sure way to kill it off faster. And if Maori is left to die, then it can be preserved as is. Because living languages mutate over time, and I doubt the purists would be happy with that, even if we were all speaking Maori as they might want.
Update: Found an opinion from a Maori academic that I agree with.
But David Rankin, a Maori academic and a leader of the Ngapuhi tribe, himself a fluent speaker, said it was a lost cause and Maori would not survive as a living language beyond a few more generations.
'Even those few of our children and grandchildren who are learning Maori still converse exclusively in English,' he said. 'That is the future, and we have to face up to it.'
He said Maori would still be used for ceremonial purposes as Latin is in the Catholic Church. 'More people still speak Latin than Maori now, and Latin is a dead language,' he said. 'I believe Maori will share the same fate.'
Rankin said it was wrong to believe that Maori culture would die without the language.
'Did Italian culture die when they lost Latin?' he asked. 'Did Russian culture die when they lost Old Slavonic? Maori culture is stronger than the language.'
He argued that the 100 million New Zealand dollars (75 million US dollars) the government spends annually on efforts to prop up the Maori tongue would be better invested in other areas of Maori development.
Related link: Yvonne Tahana: Read my lips - Maori language is dying ~ NZ Herald
Maori is a dying language, officials warn ~ Monsters and Critics
Translation found on: The only good language is a dead language ~ Vital Remnants