What reason is there to believe a generator with blades attached to it is going to lose to a generator with a containment building and reactor attached to it?
Grid scale batteries make wind cheaper by allowing less overproduction but they do that for everything by assisting grid balance and acting as a form of high frequency trading which is productive in ways other than increased market liquidity.
Fear-mongering is _the reason_ for the absence of progress and rising prices, not some technical obstacles.
Much more plausibly, the technology itself is to blame.
Although there are other options like pumped hydro (pump the water back up the hill) though clearly that has logistical limits.
I am personally of the point of view that if we went on a nuclear power plant building spree back in the day to replace coal plants/provide for growing needs and used breeder reactors to deal with waste we would be far better off. Renewables are cheaper per kWhr now however. For the future, who knows if fusion or renewable will work better for terrestrial grid applications once fusion reaches the point of a positive energy balance?