There are solid arguments to be made against both nuclear and renewables (intermittence, impact of electricity storage, amount of raw material, surface area). We can’t wait for perfect solutions, we have to work out compromises right now, and it seems nuclear + renewable is the most solid compromise we have for the 2050 target. See this high quality report by the public French electricity transportation company (independent of the energy producers) that studies various scenarios including 100% renewable and mixes of nuclear, renewables, hydrogen and biogas. https://assets.rte-france.com/prod/public/2022-01/Energy pathways 2050_Key results.pdf