Agreed, "consultation" is meaningless without a right of veto. It's vaguely defined, overly broad, and much abused by the Crown and corporations. It's also not in the Constitution. 

Yet 'consultation, accommodation and compensation' are guiding principles that have formed the basis of Aboriginal Law over the past 30 years. There is no reason government and the Courts cannot move forward by applying UNDRIP in both policy and case law without the need for it to be written into the Constitution.