The boss of New Zealand Rugby says he is wary of seeing too large a gulf in quality develop across the Tasman.

A second Bledisloe Cup thrashing, six Test defeats on the trot and a poor Super Rugby club campaign have made for a miserable 2016 rugby season in Australia.

The Wallabies barely had a chance in the second Bledisloe Test in Wellington on Saturday, failing to score a try and running the ball 187 metres to New Zealand's 411 metres.

Meanwhile, the rampant hosts and world champions crossed the line four times en route to a 14th consecutive Bledisloe Cup crown.

Even so, the second clash was actually an improvement on the opening 42-8 drubbing in Sydney a week earlier.

NZ Rugby chief executive Steve Tew enjoyed the All Blacks' victory over their rivals as much as any other Kiwi but said he did not want to have it too easy.

"We want Australia, South Africa, Argentina and Japan, who are currently very important partners of ours, to be in good financial shape and performing on the paddock," Tew told reporters on Monday.

"We like to beat Australia but you don't want it to get too far away."

The All Blacks have not lost since August 2015 and are undefeated at home for almost seven years.

'No-one wants an inevitable outcome'

The All Blacks won the Bledisloe Cup for a 14th-straight year on Saturday. ( Getty Images: Martin Hunter )

Tew made no apology for the All Blacks' strength across the field but said the union was always open to assisting its sister bodies overseas.

He said the NZ Rugby and Australian Rugby Union boardrooms were on good terms despite the turmoil surrounding the All Blacks' hotel bugging scandal in Sydney.

"No-one wants an inevitable outcome in sport, because that's the beauty of the game," Tew said.

"We can only do what we can."

The Wallabies were left gobsmacked as the All Blacks romped home in the Bledisloe opener. ( AAP: David Moir )

Tew also clarified NZ Rugby's decision to withhold the bug for five days from Australian police and claimed the hotel had been investigating.

He acknowledged in hindsight the situation could have been handled better but said the scandal was proof NZ Rugby was justified in conducting security sweeps and being on high alert.

"Probably the delay in giving it to the police is something we'll reflect on and say we could've done better," Tew said.

"There's nothing sinister about it, we simply relied on the hotel to get on and find out what was going on."

The matter was placed in the hands of Australian police.

Tew also said the review of New Zealand's disappointing rugby sevens Olympic Games campaign, which garnered just one silver medal in the women's competition behind Australia's Pearls, would be released in October.

AAP