It's literally the best thing we have going for us, even now. In terms of energy output (TW/h to grid over lifespan) for energy input (mining, refinement, const

It's literally the best thing we have going for us, even now. In terms of energy output (TW/h to grid over lifespan) for energy input (mining, refinement, construction, cooling), it's something like 10x both solar and wind. We would need to do fuel reprocessing to manage the waste output and also need to enter serial production of reactors so they could all stop being one-off designs that take forever and literally billions of dollars to certify. Build them where cooling water is available and build wind and solar where practical anywhere else. If fusion ends up working out and/or something better comes along, switch to building that over nuclear fission plants whenever that time comes and sunset the fission plants at the end of their lives. Waiting for a more convenient answer is no excuse for inaction today. We're going to need more power capacity that we have today, because we'll also have to be switching all transportation and manufacturing to electrical sources as well. Shipping is either going to need vessels with nuclear power, or that burn ammonia or hydrogen. One of the only things that we don't have any decent known answers for is what to run airplanes off of. Maybe they keep burning carbon fuels and we explicitly build carbon scrubbers for what we know they produce.