IMO they should be used strategically, i.e. concentrated large power requirements and to lower overall emissions. You want a mix of power-generating solutions, otherwise you have a monoculture which can lead to system collapse. Right now they're short on gas, but what happens when they're short on uranium, or places to put spent fuel? You can't just spin up a new power plant over a weekend (which is their problem right now). Or if we had a supervolcano and solar went out, or if winds died down, or had a shortage of parts due to a pandemic or recession, etc.
We need many solutions to cover all our bases. You spin up and down capacity in each market depending on the circumstances. This allows the lowest cost, least harmful solutions at any given time, hedges against changing market conditions, and enables emergency power relief.
edit: LOL @ all the downvotes because I said a nuclear meltdown might be bad