How is nuclear a bad idea? It’s one of the best options. Sure it’s slow and expensive, but once it’s up and running, it’s safe, and even less radioactive than coal.
Because solar and wind can be deployed much faster. You rather easily have a decade of extra coal or gas emissions, if you built nuclear today.
Sure, but why would you built a nuclear power plant, when you are faster in having a clean grid with wind and solar. The workers building the npp could built more wind and solar after all.