It will likely become significantly more expensive at scale. At current nuclear usage we use about 60,000 tons of uranium year powering nuclear reactors. [1] Global reserves are around 6 million tons, with estimates putting potential reserves around double that. [2] So that's enough for about 2 centuries of usage at current levels. Bump up nuclear by 10x and we're at 20 years until we're out, assuming all those potential reserves can be found.

The claims of endless nuclear energy rely on salt-water extraction which is like 3 parts per billion and not at all economical, or the development of breeder reactors which as of yet also remain prohibitively expensive, significantly more dangerous/finnicky owing to using liquid sodium as a coolant, and offer much easier weaponization.

Back in the 70s Exxon predicted the impacts of widespread CO2 output, but hand-waved it away. I feel people are doing the exact same thing with nuclear, and probably under the exact same motivation. They are biased towards nuclear and want it to work, and so are either ignoring the issues or assuming/hoping for a future technological breakthrough to resolve them, but as of yet that breakthrough appears nowhere in sight.

[1] - http://large.stanford.edu/courses/2026/ph241/flanagan2/

[2] - https://www.visualcapitalist.com/charted-global-uranium-rese...