Whether you think that Pluto is a Kuyper Belt Object (or a planet) is your affair. Some feel that a mission to explore Pluto’s oceans should be a much higher priority than it is now. But if Pluto is to receive robotic landers, it will be beyond 2050 because of limited resources and the difficulties of putting a spacecraft on the ground – on Pluto.
The sand dunes of Pluto (scientists have determined) are comprised of methane granules that are blown into drifts by the wind on Pluto.
It’s an exotic place. I think that there is much to be learned.