FFS. What about this amendment is extremely scary.
To address your questions - I'm assuming that you do know that with or without the voice passing a strong government could pass bills that make Indigenous delegation on a wide matters compulsory, with an enormous budget, delegates being chosen however they deem appropriate, etc...They could also stop consulting Aboriginals on a whole range of matters that most would consider appropriate - including Aboriginal communities - your fear mongering is just silly.
The voice will just ensure that some form of consultation with Aboriginal communities has to occur, even if we get a fascist government in power.
How long will that consultation take according to the constitution? Weeks? Months? Undefined? Is the voice allowed to challenge in the high court if their recommendations aren't followed? Why is this different to any of the other failed advisory groups? Why do some races get treated differently in the constitution ?