If you think this is only an arcane linguistic matter, just look to the North Dakota prairie where, as I write this, there are hundreds of people camping out in a blizzard enduring bitter cold to continue the protective vigil for their river, which is threatened by the construction of the Dakota Access Pipeline and the pipeline’s inevitable oil spills. The river is not an it for them—the river lies within their circle of moral responsibility and compassion and so they protect ki fiercely, as if the river were their relative, because ki is. But the ones they are protecting ki from speak of the river and the oil and the pipe all with the same term, as if “it” were their property, as if “it” were nothing more than resources for them to use. As if it were dead.
So to be clear. Kimmerer advice is not just creating a pronoun will be sufficient and that can instinctively create a respectful and reciprocal mindsets among those who use that pronoun. Rather, a whole culture needs to be created, as she is citing here of the Native Americans' relationship with nature. It's a relationship that's deeply cultural and which manifests itself on the linguistic level. The so language and culture go hand in hand.