My opinion is that the nickname should stay. Although, you say that it should be an issue that those who are against it should deal with it, but as I see it, what is there to deal with? The University is HONORING the Sioux nation of Native Americans because they are a very strong people. The University isn't using the nickname to try and make fun of them or put them down.
My question is who are these people that are against it? Is it mostly Native Americans or is it these liberal white folks that don't understand what they are opposed to?
The University, along with other universities and professional athletic teams, is HONORING Native Americans. That should be the end of the argument, but it will never be as long as there are people who don't know what they are arguing about.