We’re out of options. The only conclusion is that we can’t stop at Pluto. As a result, New Horizons is a flyby mission. It’s going to come within 6,000 miles of Pluto, but only once. It might seem like a waste to just go past Pluto once and end the mission; NASA agrees with you! Since launch, the plan has been for New Horizons to visit another Kuiper belt object after visiting Pluto. The problem is that we don’t know of many objects close enough to Pluto for New Horizons to visit. At launch, we didn’t know of any.