Diversity of skin color is meaningful in many ways, but that's not the greatest example. Policies that have changed in recent years include giving transgender individuals protected class status, as well as gay marriage being legal, federally.

There are also the states legalizing marijuana to consider. If the war on drugs is in fact a racist policy, then turning back the pages on that, wrt the most common, least harmful drug, then real policy changes are being made. Furthermore, the current congress has introduced legislation to legalize marijuana federally. So yeah, we are seeing policies change.