My primary concerns about ISS being extended are ...
1. It is a money soak. It eats a nontrivial amount of the NASA budget. This could be spent on Artemis, 'Ares' and/or more unmanned probes/space telescopes instead.
2. As far as actual concerns about the physical infrastructure of ISS, I am more concerned about the seals leaking between modules than I am about the Russian segment. The seals were only intended to last to 2024. The new Axiom modules could bring a lot of the missing pieces (life support, frex) if the Russian segment is going to start getting 'sick.' The Axiom modules are intended to be floated off at the ISS EOL to become its own space station. I would assume they have a plan for life support and power.
1. It is a money soak. It eats a nontrivial amount of the NASA budget. This could be spent on Artemis, 'Ares' and/or more unmanned probes/space telescopes instead.
2. As far as actual concerns about the physical infrastructure of ISS, I am more concerned about the seals leaking between modules than I am about the Russian segment. The seals were only intended to last to 2024. The new Axiom modules could bring a lot of the missing pieces (life support, frex) if the Russian segment is going to start getting 'sick.' The Axiom modules are intended to be floated off at the ISS EOL to become its own space station. I would assume they have a plan for life support and power.