I don't think we can assume that Latino's will integrate poltically, look at African Americans.
We can't assume that they will and we can't assume that they won't. My point is that we just don't know. Whatever racial categories that we have today might look completely different several decades from now. For example, "Hispanics" weren't always considered a separate racial category in the way they are today. Neither have Arabs for that matter. Sometimes they have been considered a separate racial category, and sometimes they haven't been.
In any case, as pointed out in the column I link to, there's an increasing number of cross-racial marriages between non-Hispanic whites and Hispanics, as well as between whites and Asians, who are producing an increasing number of biracial and multi-racial offspring. Exactly how those children grow up to think of themselves, and whether they even grow up to think of themselves in strongly racialized terms at all, is an open question.
True, you never know for sure. But given the nature of American racial and social hierarchies it would be most likely that biracial Hispanic/Whites would identify as whites and that light skinned Hispanics generally will start identifying as whites. Many biracial Asian/Whites will have an upper middle class background and people with high social status are generally perceived as whiter than people with low status.
My guess is that the US will have an increasing group of people who are perceived as Whites without having a 100% European heritage.
