So aboriginal people who have lived there for 65,000 years, want a voice in parliament? And Australia has never made any formal treaty with them? Tell me how this will wreck parliament, as you put it, Bambi. Seems like the main problem would be if the Voice turns out to be symbolic and toothless.
But generally, when you include people in a democratic system, it improves relationship between their communities and the rest of the nation. Reuters informs that voting yes aims to (quote) help mend fraught ties with the Aboriginal community and unite the nation, and the advisory body will help prioritise Indigenous health, education, employment and housing.(unquote).
To rectify racial/ethnic discrimination, as has been proved around the world, you do have to formally recognize that race/ethnicity. Pretending everyone is colorblind is generally a way for white people to feel good about themselves and ignore fixing systemic racism.
If I'm standing with my shoe on someone's face, I am not going to help that person by saying there are no people on the ground and it is divisive to act like there are.