The Government of the day will be able to completely ignore them like they ignore climate scientists and environmentalists.
This is how it is supposed to be. They're ignored, but so is everyone else. We all wish that the government would only listen and act on our preferences and beliefs, but the system is designed so that every Australian citizen receives one vote to elect their preferred representative and we must engage with that elected representative to guide parliament.
There are always going to be lobbyists, special groups, or even corruption that interfere with this system, but these are issues that can be managed by legislation and government processes. Indigenous Australians already have The National Indigenous Australians Agency (NIAA), employing 1,023 full time staff and a budget of $285M each year specifically for the purpose to "lead and influence change across government to ensure Aboriginal and Torres Strait Islander peoples have a say in the decisions that affect them."

Regardless of race or ancestry, let's all be ignored by government equally.