The problems lies in the lack of storage. Which is why you need efficient and scalable battery technologies. This is the true key technology that yields much more promise than anything nuclear.

How is it stalling anything if it offers a cheaper and faster build than nuclear? If you need to build 1GW and want it anytime in the next 2 decades, you sure as hell don’t choose nuclear. You either do natural gas or renewables these days. Those are the only competitive sources of energy.

You actually need energy even when the sun doesn't shine.

And you are incorrect: renewables are not competitive without heavy subsidies and preferential treatment, such as being allowed to shift the cost of their intermittency onto the reliable producers.