No, I don't agree at all that an orchestra should be pressured into presenting a more racially diverse group on stage if those choices aren't based on pure merit. Again, would you argue the NBA should do the same? NBA rosters don't come close to resembling America's racial diversity. Even if the musicianship are "close" in skill levels, someone will still be considered more skilled, and in an objective evaluation based purely on merit (which a blind audition promotes), the more skilled person should win out. It's not fair to award bonus points or to dock points for things you don't have control over. To me, it's condescending. "You weren't good enough, but we want you anyway because your last name is Hernandez and you're a first generation immigrant." The better solution here is to close the wealth disparity gap so that minorities will start on relatively equal playing field from the beginning.
I'm in the "arts," and would not want my work chosen because I have a collection of genetic material I had no control over (I'm not pure white). "Oh, you're 25 percent native American. Wow, your ancestors (who I don't know) were really oppressed. Here's a cookie."