"For the first time, racial and ethnic minorities make up more than half the children born in the U.S., capping decades of heady immigration growth that is now slowing."
As our world becomes more integrated, especially through procreation, I think race will become less of a contentious issue in our communities, and in our politics. Until the day we are all Cuban-Irish-Kenyan-Vietnamese-Inuit (or what have you), there will be strife, but at some point, our country and others will reach a point where, for most everyone, ideas become more important than color. I don't think there are "loss of biodiversity" issues (say, with resistance to epidemic illness), as the human gene pool will remain massively varied from person to person.
It's true that some communities (ultra-nationalists, racial pride groups) will want to remain separate, and that's their right. These people also have the right to huff ammonia-rich cat urine, as I'm sure many of them do. If trends continue, these groups will continue to dwindle in comparison to the modern world progressing and melding around them. Maybe then, with the help of a little secularization (or at least a little modernization and ongoing reconciliation of the various religions), we can focus on the important things, like public policy in the marketplace of ideas, and the use of technology to better the lives of all people.
Unless you enjoy genocide abroad and racial tension at home, I think you have to be an optimist about this development.