In general, so not just Karrakatta ...
Of course, significant funding of these cemeteries needs actually continues to be ongoing for generation after generation ... And burials obviously occupy a far larger portion of land than cremated ashes. When the land 'runs out' there is a huge set of decisions to be made. Different generations and different cultures and even within families - they can all have their own traditions about death.
An example ... Around the time Australia was becoming a Federation ... circa 1900 ... Central Railway Station in Sydney NSW was built upon the former Devonshire Street Cemetery. Re-internments were made for those whose descendants who knew this was available. And earlier, around the 1820s Devonshire Street Cemetery had been the replacement cemetery for an earlier one in Sydney Town ... That earlier one was only built over when Sydney Town Hall was constructed.
https://www.cityofsydney.nsw.gov.au/learn/archives-history/sydneys-history/people-and-places/old-sydney-burial-ground The question becomes: who is responsible for the ongoing funding of any these cemeteries ...
- is it the responsibility of descendants and if so - for how many generations, how much $$, paid annually, or $$$$$$ paid as part of the funeral costs, and what should it cover ... headstones, repairing headstones, access, weeding, record keeping, religious customs, and etc...
- is it the responsibility of the Cemetery Trust or similar organisation - how are they to raise the funds ... and who regulates their activities...
- should it be the responsibility of 'the government' ... as in should it be the same set of laws across the entire nation of Australia ... or perhaps each state can make its own set of laws, effective across that particular state ... or perhaps each local government authority make their own local by-laws.
JM
Headstones from the first fifty years of local settlement are historic monuments and should ideally be preserved, or at the very least not vandalized by the management of the cemetery where they are located. Typically they have committees who evaluate the worthiness of the person interred or of the headstone itself to decide whether or not it should survive. One reason for not destroying the headstones now is that ideas about people's "worthiness" tend to vary over time (including who should be on the committee).
The older graves are the ones least likely to have family protection because that would require awareness of interment rights or even burial location to survive across several generations. Even my grandmother's headstone was destroyed because my aunt who died young had the interment rights, and that's just across two generations.