> Some humans are likely to become more powerful than other humans some day. Most such humans will by default develop instrumental subgoals that conflict with other human interests.
It has been true multiple times throughout history. Every time some negative feedback kicks in changing the rules of the game enough for a certain balance to exist. If anything, it seems this balance tends to improve every time -although it might be too early to tell. However it does seem to me that the difference in power among humans (no matter how power is defined) is never big enough to make "other human interests" irrelevant.
Indigenous peoples have always suffered this problem. The difference with superintelligent AI is that (unless the problems are addressed) it will make the global elite suffer, too.