As Prince Harry and Meghan Markle finalise the details of their departure from the royal family, there is talk the monarchy's relevance will plummet without their near-celebrity status.

But the results of an exclusive Nine poll have revealed more than half of Aussies believe the royal family will be just as relevant without the Sussexes following their decision to step down.

The royal family's popularity hangs in the balance as fan-favourites Prince Harry and Meghan Markle call it quits. (AAP)

A whopping 57 per cent of the 1,114 people surveyed agreed the monarchy's relevance will remain the same in the coming years, even though the royal couple with the most 'star power' have departed.

"I love the royal family but don't give a toss about what Harry and Meghan do," one respondent wrote.

Many cited the Queen's popularity as the reason the royals will remain relevant, saying the beloved head of state has "held the family together".

Fans believe Her Majesty will keep the royals relevant even without Harry and Meghan. (PA/AAP)

"While Her Majesty lives, the Royal Family has relevance across the Commonwealth. It remains to be seen once she passes," one wrote.

"It feels to me the British Royal Family has been held together by the Queen," added another.

"I think the real litmus test for their survival and relevance will be when she passes away."

It's true the Queen, who is now 93, will likely come to the end of her long reign in the coming years, but another set of popular royals may be able to maintain the family's relevance.

As the Queen grows older, Prince William and Kate Middleton are stepping up their royal roles. (EPA/AAP)

Eight per cent felt that the royals may become more popular without Harry and Meghan, as it will put the focus back on Prince William and Kate Middleton, who will one day be King and Queen Consort.

However, some Aussies disagree, saying the royal family's popularity is going to plummet without the Sussexes around to maintain public interest.

Two per cent of respondents said the monarchy will become totally irrelevant in the coming years, while 16 per cent think their popularity will drop, but not completely disappear.

The survey results showed 57 per cent of people think the royals will stay relevant. (Nine)

A further 14 per cent added they don't even think the royal family were relevant to begin with – ouch.

"I personally do not follow the Royals and disapprove of their celebrity status," one said, before conceding: "However I don't mind the Queen as head of state."

Respondents also weighed in on Harry and Meghan's departure, writing that it could pave the way for a slimmed down monarchy in the future.

The Sussexes departure could pave the way for a slimmed down monarchy. (PA/AAP)

"Those who are further down the line of succession should be allowed and encouraged to be private citizens," one person wrote.

"It's hardest for the spare as they're in a holding pattern until the heir has his/her own heirs. But they've elected to go now, and we should leave them alone."

Another added: "I think the Queen offered a fair and balanced response to Harry and a slimmed down Royal family is the way to go."

Others felt Harry and Meghan's departure is nothing compared to Prince Charles' ascension, with many speculating Charles becoming King could truly rock the popularity of 'The Firm'.

Many Aussies believe Charles should give up his claim to the throne in favour of William. (AAP)

"The Royals will become less popular once Charles is King. The Queen needs to hand it to William not Charles!" one said.

A previous Nine poll revealed one in three Aussies want to see Charles step aside and let his eldest son take the crown when Her Majesty eventually gives up the role or dies.

That survey, completed by 829 participants, saw that 32 per cent agreed abdication of the throne was the best course of action for the Prince of Wales.