This is only a fear of white racists. There will always be races of people. There will always be a white race. The reason why intermarriage is on the rise is due to the taboo of it and the ignorance of other races. As the races start to interact and learn more of each other. I think it will decrease intermarriage more than increase it. Then again if your race is so superior then your race members should not be so willing to find mates outside of it. When whites intermarry it dilutes the white race. White scientists are prepared for the worst. They will just clone more whites.
you're all over the map Akbar, but to answer your only coherent point, no, self-determination and maintaining racial identity is not synomous with 'supremacy' or wanting to dominate others.
Some of these arguments, especially from the 'civil rights' crowd are so ridiculous they'd have you believe that if a group of whites were to fly to Mars, and some minorities smuggled themselves into the cargo containers they would be justified in crying 'discrimination' if they weren't allowed to join the colony. :-P