The professional management style O'Neill is calling for is at odds with the IRB's old boys' network which can be dominated by a northern voting bloc.
O'Neill had a mild dig at Tew, who said New Zealand might quit the tournament after it had cost them $13 million, and also Miller, who said the All Blacks would not be missed.
"Threatening to boycott a World Cup is not our style - the notion that any team is replaceable is also nonsensical," said O'Neill.
"Let's get away from the hurly-burly of the tournament and resolve the issues together [without] the divide and conquer."
The Tri-Nations countries were united over their financial grievance, which was "no frivolous matter".
Despite O'Neill's diplomacy, the IRB bosses will feel threatened. Asked if the voting structures needed changing, O'Neill said the ARU was using Aussie rules as a model for change.
"Democracy means different things to different people," he said. "We're 15 or 16 years into the professional era and a lot has happened, a lot good. But everyone must move with the times.
"It's time to take a serious look at the IRB."