Launching isn't the only thing you need to do to build a replacement, there's building it twice: once on Earth and again in space. The ISS was assembled largely

Launching isn't the only thing you need to do to build a replacement, there's building it twice: once on Earth and again in space. The ISS was assembled largely by hand by astronauts working out of the Space Shuttle which has an airlock that none of the current capsules have so they'll have to work out of a seed station launched in a single go or we'll have to wait for a crew Starship. That's a long ways off even if you don't account for Musk's habit of promising things are coming soon.