This argument sounds like "oh, in the end it doesn't matter, we can just continue on!". But this is completely wrong. You cannot dump 50°C hot water into rivers

This argument sounds like "oh, in the end it doesn't matter, we can just continue on!". But this is completely wrong. You cannot dump 50°C hot water into rivers without consequences, and very far reaching consequences at that. They are already very very borderline, because we are talking about something slowly creeping towards 30°C already, in large quantities. Which also means you have to plan accordingly for all the new nuclear power plants, otherwise you are building a new ruin, pretty much. For the "near" future you can assume the dry and hot periods will continue like that, which means that long term projects like nuclear power plants have to be planned accordingly. Considering the accelerated progress of climate change that should include a lot of risk "buffer", if not a different approach to deal with the cooling water, for example.