His comments suggest he hasn't ruled out another term beyond 2017, ahead of the 2019 World Cup to be held in Japan. Graham Henry's eight years in charge as All Blacks head coach - after he and then-assistant Hansen survived the 2007 quarter-final loss to France - is the longest reign in modern times.
Hansen's appointment, effectively ratified by the NZRU board in October, and confirmed by the board recently, was a victory for common sense and continuity.
Next year's World Cup, which starts in September, clearly looms as a massive challenge, but so too does 2016, when Hansen is likely to be without a whole host of experienced players, including Dan Carter, Richie McCaw and Ma'a Nonu.
Allowing him to continue the work he has done since taking over as head coach from Henry in 2011 should help with that, the only concern for Tew is the fact that other New Zealand coaches could become disillusioned.
Tew said: "There are a lot of people out there who will aspire to be the All Black coach and we hope that this is not a disincentive for that aspiration because we want those people to be working very hard so they're in great nick when we are ready to go contestable, which may well be in 2017, we'll have to wait and see how that transpires."
The other pressing appointments for the NZRU are the confirmation of Hansen's assistants - the 55-year-old said he hoped Ian Foster, Mick Byrne and Mike Cron would decide to extend their own contracts.
Hansen said he would allow them to decide over the summer.