The problem is that operating a nuclear power plant is more expensive then gas power plants or renewables. We also see a massive drop in battery prices, so utility scale batteries see massive growth. The other key technology is hvdc. It is always sunny or windy somewhere. So being able to transport a lot of electricity means less need for base load. It also allows connecting to hydro power plants with reservoirs, which can act as massive storage systems. Also keep in mind nuclear takes a decade from initial plan to actually producing power. Costs for all of the other power technologies are falling rapidly.

Renewables are not as variable as a lot of people seem to think. Especially on a large scale.