It called for an urgent hui to find solutions to questions on how Maori rights over fresh water are recognised.
The tribunal issued its report on claims brought by the council and 10 hapu and iwi, which sought to delay the Government's partial asset sale programme until Maori claims over water were considered.
At first Mr Key said the tribunal's decision would not stop him - but a week is a long time in politics.
Obviously his political ally, the Maori Party, has put pressure on him to delay the sale and he has probably received Crown legal advice that there could be more pitfalls ahead. He has made the right decision and will use the time to consult more with Maori.
One can't help thinking that Mr Key may have painted himself into a corner on this one. He may find himself consulting more people than he originally thought he would have to. This is good for democracy but not necessarily good for Mr Key's plan to sell state assets.
Already his political foes, Labour and the Greens, are demanding that Mr Key consult all New Zealanders by holding a referendum on the subject. The Green Party is in the Keep Our Assets coalition, which has collected 240,000 signatures as it strives to get the 310,000 needed to trigger a citizens' initiated referendum.
The coalition launched a drive aiming to collect the remaining signatures by the end of next month. Mr Key would not have to listen to the referendum result but it would put even more pressure on him.
It is going to be an interesting few months for Mr Key.
Suddenly it does not seem like it is all smooth sailing for the National Government.
Our populist Prime Minister is probably aware of how much he has to lose if he gets this one wrong.
Only time will tell.