I disagree with Yerusha's interpretation of the scriptures he refers to.
Indeed there will be a great destruction of all the evil in the world once Moshiach is revealed. But the evil is not only from the 'hamatic' tribes but also from the tribes of Ishmael and Essau, and also the wicked Jews.
Also there are good blacks who will be spared this destruction. We know the Torah acknowledges these good descendants of Ham, as Avraham Avinus servant Eliezer was a descendant of Ham... Eliezer was a righteous man.