How long until the majority of people are mixed race? This is inevitable, right?

In the future, due to globalization, nearly everyone will be mixed race. And the farther into the future we go, the more homogeonized the mixture will become. Eventually, everyone will be nearly identical in terms of racial composition. Everyone will likely be cream or coffee colored with dark colored hair and eyes. Ethnic, racial, and national identities will become obsolete.

Will this be a good thing for society? Is this the liberal utopia?