TVNZ has come under fire this week for its decision to start screening the show two hours earlier from October 17 and replace it with MasterChef Australia.
An online petition aiming to stop the change already has 4484 signatures.
The Prime Minister indicated, possibly tongue in cheek, that he would come to the rescue of the long-running show.
"I'm going to speak to someone important enough to see whether that can happen."
Not that he watches it. As Mr Key reminded RadioLive host Paul Henry - when he's not playing DJ, he's got a nation to run.
A statement in response from TVNZ said that like all viewers, "the Prime Minister is entitled to his personal opinion".
The question of the week, according to Mr Key, asked if he could save Coronation Street.
He said he grew up watching Coronation Street and would probably be "carted out watching Coro".
Subject matter
Prime Minister John Key's talkback topics:
OK
cats, favourite food, outer space, the Warriors, Rugby World Cup, hobbits
Off limits
politics.