I could be wrong, but doing this sooner rather than later seems like good strategy to me. Remember, the tribal governments could do absolutely nothing over the next three years and force UND to retire the nickname by simply sitting on their hands. This way, our highest state officials make the tribes' highest officials fully accountable for the decision. They have to decide whether to abide by the wishes of the majority or do what they feel like doing. The sooner the tribal governments make their decision, the more time the voters have to express their concerns at the polls and other ways.
This assumes that there really is strong support for the Fighting Sioux nickname on the Standing Rock and Spirit Lake reservations. One way or the other, we will find out.