As we near 500 comments on this thread thought I would offer one personal note intended to clarify where I tend to stand, as often I have found myself trying to explain my understanding (as imperfect as it is) of the legal situation more so than declaring my own preferences.
FWIW, I wished the court would have ruled in favor of WY on issue preclusion/estoppel grounds in light of Repsis. I am concerned that local tribal governments are stretched thin and have bigger problems on their hands, and it is difficult to see how they will "police" the off the reservation treaty rights exercised by their members. In a less politically charged time, they may well ask WY to enforce rules like wanton waste on their behalf, but I doubt that is a political reality in 2019. I am concerned that an understandable desire not to be told what to do by non-indians may result in reluctance to do the "right" thing by way of conservation and sustainable herds. I am also concerned that the state of WY will want to pursue "victory" at all costs and not sincerely bargain for a middle ground outcome. But I am neither a WY resident or a tribal member so I will try to be understanding of their opposing positions as I watch from afar.
In the end, the most important thing to me is that the rule of law prevail over the immediate desires of a power wielding portion of society. Too often in our history involving matters of race, the urgent need of the majority (land, oil, field labor, heat of war, fear of former slaves and now desire for a particular approach to game management) has trumped the rule of law and principles underlying it. Our SCOTUS has signed off on politically favorable (at the time) and expedient rulings in things like Dredd Scott, Korematsu (japanese internment), Chae Chan (chinese immigration), Plessy v Ferguson and Race Horse. I am glad this time that they did not do that. I believe that both the court's holding and its dissent were logical and thoughtful approaches, I preferred Alito's approach but can respect Sotomayer's as well.