Why US May Never Be Majority Minority

Lots of projections that in the next 30 years or so, given present trends, the U.S. will have no majority ethnic/racial group, but instead assorted minorities will form a majority.

My title tries to be provocative, but here's the rationale:

Think of U.S. society as a giant amoeba-like monster, operating in a world of other smaller amoebas.  Occasionally it feeds by absorbing an amoeba.  Once it was the Irish, then the Germans, then the Jews, then the Poles, etc. etc.  Viewed from history, it's a process which does these things:

• ensures the "white" majority stays in the majority.
• gives a minority a chance to become (part of) the majority. Adopt cultural patterns and don't insist too hard on drawing boundaries and you're in.  Look at Jared and Ivanka Kushner.
• leaves a segment of the minority to become the minority. ("Jews" today means something different than it did 70 years ago, as do all the ethnic/racial/religious lines we draw.)

My own prediction, and unfortunately I won't be around, is that cultural changes together with extensive intermarriage will mean that many Asian-Americans, Middle-Eastern-Americans, Latinos, and blacks will become "white" for cultural purposes.  For example, Malia and Sasha Obama are already white, just as many African-Americans say their father was and is.