Te Wiki o te reo Maori has come and gone.  Originally introduced to highlight the precarious existence of te reo and then to celebrate it as one of the official languages of the country, one can say fairly confidently that te reo is now accepted as an integral part of the New Zealand culture and pysche.

The fate of te reo as a spoken language in a modern context is ultimately with Maori themselves. It is part of Maori identity and cultural practice.  If we Maori value those parts of our Maori existence then te reo is inextricably tied to these factors.   It is the glue by which the demands and benefits of our culture are bound and communicated. 
Despite the efforts of the Taura Whiri o te Reo and others in the community the work needed is not complete.  Sadly there are Maori communities now where it is a struggle to find a speaker of te reo competent enough to extend even an elementary speech of welcome on the marae.  Those communities suffer embarrassment and loss of mana, but hopefully such a situation will fire them to turn their attention to seeking te reo, especially te reo of their own ancestors. 
My experience has been that the female elders and members of the whanau and/or hapu have been the ones seeking the change to hold onto te reo. The beginnings of Te Kohanga Reo are testament to that.  It should however be the responsibility and desire of all tribal members if we are to have something of value to leave for the later generations.
Many refer to learning te reo me ona tikanga that is the language and the cultural practice.  One is in need of the other and that is how it should be.  For Maori, that would be an ideal situation because the cultural practice would have more meaning and depth.  Maori still need to persevere in the learning and retention of te reo because in the end of it no one else will.