I find the idea of destroying the International Space Station very depressing. Centuries from now, when hopefully humankind will have widely expanded into the galaxy, our ancestors will be fascinated by it. We know this because of our own deep connection to ancient artifacts preserved in the world's museums.
The current plan is to destroy the ISS circa 2030 by burning it up in the atmosphere with a deliberately destructive deorbit. It seems with just a little more effort and imagination we could transport an unmanned ISS to somewhere like an Earth-Moon Lagrange point L1 and park it there for future generations and a future space museum.