"We think it's disappointing that we didn't continue to try to find solutions to some of the issues we knew still existed but we accept the fact that not everybody agreed with it.
"We had a parallel piece of work under way so we are ready to talk to our broadcasters as we are required to by contract by the end of this month about what we've got to sell."
The biggest stumbling blocks for the Northern Hemisphere nations were the threat of relegation and the added travel.
The All Blacks last hosted Wales in 2016. The first two tests in Auckland and Wellington were relatively close before a 46-6 blowout in the final match in Dunedin.
The All Blacks last played Wales in 2017, a 33-18 victory in Cardiff.
Scotland last toured New Zealand in 2000, losing tests in Dunedin and Auckland 69-20 and 48-14 respectively.
Tew added that the official inquiry into the allegations of misconduct by Crusaders players in Cape Town recently was ongoing and that he had told the board he was willing to leave his post earlier or later, if required.
A fortnight ago, Tew announced his resignation after 12 years in charge.
"My hope is that whoever takes over this role will be able to come to the Rugby World Cup and experience that so they get that experience but it depends who they appoint."