Correct me if I am wrong but the only reason nuclear is expensive is because of how costly the facilities are to build and maintain. If we were not setback during the anti-nuclear era, we would have gained economies of scale. The reason why solar is so cheap is for the exact same reason is it not? I am not an expert on this topic so take everything I say with a massive grain of salt as I am willing to be wrong on this.

Edit: After further reading it appears that solar will be the defacto affordable option in energy production, even with SMRs and streamlined construction in the picture. Perhaps a mix of renewables, better battery infra, and SMRs for stable sources of power is the future.