You've identified one of the biggest obstacles in advancing this discussion, that being the notion that a "former world" is gone forever. In reality, all cultures morph and evolve a little bit with each generation, often within a generation - just consider the impact that computers and the internet have changed the world and communities today. My point being - there are a myriad of outside influences that force that evolution.
I am not a member of any First Nations group and therefore I am on the outside looking in, however, on those occasions where I hear of the conflicts described by those vocal aboriginal groups, I am left with the impression that had Europeans not landed in the America's that these communities would have experienced some form of stasis like a frozen moment in time.
Hey SC, our former world is gone forever too. Women used to be property and as recent as the 1970s there was laughter in the House of Commons over wife abuse. Ask yourself, is this world coming back anytime soon? The traditional world we all lived in not to long ago is passing.
I once saw on CBC a reporter discussing with an Indian man how to solve the problem of women retaning citizenship and rights when marrying a white man, the Indian man replied, "I'll solve the problem with Judge Colt." Perplexed, the reporter asked what he meant, meant and the Indian man answered, "Colt 45." As in a gun, he would shoot a problem woman here. This world has passed by.
The modern world has made most personal violence obsolete, and also religion, slavery too. The industrial revolution has caused immense social and cultural unheavels in its wake. The "former world" fades, but its legacy persists like the ancient Egyptians.