USA, Canada, Australia, New Zealand, and similar nations are settler-colonial nations where the indigenous people have been genocided to the point where settlers vastly outnumber them. How is decolonization going to work in this situation?
Bonus: How is a post-revolution Japan going to reconcile with the Ainu and Ryukyu people?
Speaking as an Australian I don’t see it happening through any natural means. Even if daddy US collapsed over night, the leadership of these countries would sooner try to ape the glory days of the US than they would bolster their own nations people