Ardern would not confirm whether ministers would soon consider the proposal for a new public media entity.
But it was obvious public broadcasting was needed now more than ever before, she said.
"We are seeing a change in the way companies access revenue, we're seeing a decline internationally in journalism in terms of their revenue sources, it's become a really difficult environment, so we do need to support public broadcasting."
The government was actively looking at the best way to support public broadcasting, and recent events reinforced the need to do that, said Ardern.
"We have set up networks of advice and that's coming into government but we haven't made any decisions yet.
"We haven't finalised timelines but obviously the minister has been working on this issue for some time - as soon as we've made decisions of course we'll make them known."
National immediately came out against the idea, warning it could dismantle any plans to form one single entity if it is in power after next year's election.
Leader Simon Bridges said the government lacked a mandate to make such a major change.
He said a combined state broadcaster would be "worrying". "Where it took an editorial line - and it inevitably would - that would become the received wisdom ... a liberal democracy needs many voices that check each other."
Ardern shot back saying allowing the decline of journalism in the face of new, competing forms of advertising was bad for democracy.
"We cannot afford to have our journalistic integrity compromised by being unable to fund and run decent, both journalism and broadcasting.
"I do think there's a risk here, but bolstering public broadcasting is the answer, not the problem", she said.
Ardern was asked whether Labour would campaign in 2020 before making any major changes.
"We already campaigned on a platform of public broadcasting and I think what we're seeing now demonstrates why that's important."
In terms of certainty for public media in New Zealand, she said ultimately the choice was either making decisions that "bolster public broadcasting, or we choose to do nothing".
"And I don't think doing nothing is an option."
Bridges said National accepted it was a "difficult media landscape" with constant change but there were alternative solutions like increasing funding to NZ On Air "to ensure there's good quality news in New Zealand.
He said he believed any change should be a bipartisan decision "so that it is an enduring set of solutions. And if it's not, I think National would need to consider unwinding a solution it disagreed with in office".