I think the Dems would secretly want it struck down, to motivate the Left to try any and every means to put a Dem majority in power that would change the law in favor of Affirmative action.
I don’t think so — racial preferences have never been all that popular, and in fact are still illegal for most employers, including government. If the Supreme Court comes out and says “content of character, not color of skin”, that’s a genie the left will never get back in the bottle.