We have or will have N types of renewable generation (hydro, solar PV, solar-thermal, solar-hydrogen, wind, wave, tidal, geothermal, maybe biomass, maybe some kind of engineered plant things generating electricity, who knows) and M types of storage (pumped-hydro, thermal, P forms of chemical battery, hydrogen, gravity, flywheel, bio-fuel, compressed-air, who knows). Fairly soon they will give us costs lower than nuclear, and far less climate damage than fossil. We won't be "constraining" ourselves much by using a mix of the best choices, instead of trying to keep an also-ran tech such as nuclear on life-support.