The specific station module with the leaks, Zvezda, is one of the oldest modules. It actually started construction in the 1980s as a Mir flight spare and then was repurposed as the core module of the never-built Mir 2 space station. It can’t be replaced even if there was time before the 2030 ISS retirement date to design and build one. If Zvezda fails earlier than that, we could see that retirement date come sooner.