That's a good point. I wonder what the probability of all other renewables being knocked offline at the same time is, though. For some areas, you might need >50% nuclear for a higher baseline but that can probably be a lot lower e.g. in the desert, where the sun is more consistent. It does depend on how the whole grid is set up. Maybe 20% on average is plenty alongside wind, solar, hydro, wave, hydrogen(?), new storage methods, and whatever new production tech comes out.