So what happens to your existing installations when China stops selling renewables? They will keep working for years as you find new suppliers for spare parts.

So what happens to your existing installations when China stops selling renewables? They will keep working for years as you find new suppliers for spare parts. When the reach EOL you need to find a new supplier. In the meantime the already existing required firming capacity might be run a bit harder to manage any shortfall. But in the nuclear cult that is equivalent to still not being able to decouple Europe from the Russian nuclear industry 3 years into the war.