No, racism will not suddenly disappear after white people are no longer a majority. But, if California is a precedent, the racism that springs out of the “threat” of white people being worried about no longer being a majority will go away, when most realize that the “threat” is not really anything to worry about, and those who still cling to that idea are too few to be much of a bother.
So what kind of thinking underlies the perceived “threat” of becoming another minority group?