>Let's say that some kind of link between race and intelligence were proved and universally acknowledged, what possible positive outcome could entail?

Intelligence enhancement would become a cheap, simple, universally-available gene therapy, since we would have found that it only relies on a few alleles of a tiny number of genes, so simple that it can differ significantly between ethnic groups that can still interbreed, rather than being a complex, many-gene feature that evolved chiefly among the species as a whole.