Fission will always be there if the alternatives don’t pan out. Its cost is way too high ATM considering the alternatives, but as those alternatives are exhausted, we still have 90,000 years of nuclear fuel to exploit if we need it. The other possibility is that its cost comes down, then it is competing on a more even field with other renewables.

Storage works really well with nuclear, which by itself is very hard to ramp up or down (worse than coal, in contrast to gas and hydro that can work on demand).