> building new nuclear power plants will be too expensive and too late, since we'll have figured out a renewable energy concept that'll handle the load by then.

That's a helluva prediction.

Thorium reactors would be practically limitless in fuel supply, but we aren't getting them without seriously funded nuclear research. That is far less likely during a band on commercial stations.

>Thorium reactors

The same reactors nuclear powers with decades of experience haven't deployed?

We will get two or three revolutions in solar power and battery technology before a single thorium reactor is viable. You could invest all the R&D budget of thorium reactors in perovskite panels and it would generate more MW per CHF invested.