And i don't think Brazil would want to expose themselves as much as South Africa did(, nor China for that matter), more to lose than to gain, that's justice. Bolivia probably only supported the case because Luis Arce has forbidden Evo Morales from being reelected and is trying to show that ~'he's not a traitor to the movement' despite that.
Let's say that they have a chance if you want though, it doesn't matter because that's not what would make a change, do they only have the option of a full-scale war with unknown consequences to do what's right ? We're just supposed to watch and then it'll be as if nothing ever happened, ok.
It does matter, because a success will collapse the so-called "rules based international order" propaganda that the US uses to justify imperialism. Obviously it won't stop the genocide and it won't stop US imperialism, but it raises and heightens the contradictions.