My personal reaction to this is that the rest of Australia should just say to Mick Dodson "Ok, what date do you want?". I reckon he would then get confused about how to respond and what he was going to whinge about next, then go away and sulk.
Anyway, if we were going to change it what would be a good day? Perhaps we could suggest changing it to 27 May, the date of the 1967 referendum? That would really flumox old Mick.