One of the Yes arguments is that if they made the Voice legislatively instead of via a referendum, a future government might undo it
This is literally my reason for voting yes.
If the NBN taught me anything, it's that the Liberals will make decisions to the detriment of an entire generation of Australians for the sake of votes. They will not hesitate to throw a minority group under a bus for the chance at an extra marginal seat.
I don't know enough about The Voice to know if it's truly a good idea or not, but people far more qualified than me have spent a lot of time coming to the conclusion that it is. Therefore I've decided to trust in their credentials-backed advice.
Whereas with the NBN, I did know enough about it to know it was a great idea... and had to watch equal air time get given to people with malicious intent tell blatant lies to convince people with no idea how to vote. Then those same people posted on Facebook with great authority about why they were voting the way they were voting using the lies they'd heard.
I have no doubt that if this was some temporary or easily removed thing, the Liberals would just campaign on removing it regardless of it "working" or not.