The experience curve for PV follows a power law, where a doubling of cumulative production reduces cost by about 20%. At that rate, when the world is powered by PV, the PV would be producing energy at < $0.01/kWh, and even less in the best locations.

With that cheap solar, it would be better to just heat up a big pile of rocks with resistive heat and use that to drive steam turbines, instead of using nuclear fission to make the steam. Artificial geothermal.