There are many isotopes of Plutonium. Pu-238 has a half-life of 88 years and is used in Radioisotope thermoelectric generators. That's the isotope that's running out.
So, of course, we come up with schemes to get rid of them, like blending some in with other nuclear fuel. Such as what we did in Unit 3 at Fukushima Daiichi. And then hydrogen gas caused massive explosions, releasing radioactive material. Oops.
A lot of the other isotopes will be around for many many years. We have more of those than we need. https://en.wikipedia.org/wiki/Isotopes_of_plutonium
So, of course, we come up with schemes to get rid of them, like blending some in with other nuclear fuel. Such as what we did in Unit 3 at Fukushima Daiichi. And then hydrogen gas caused massive explosions, releasing radioactive material. Oops.