People dont deem to realize that dams are super expensive, dont last forever and can cause cataclismic failures when they break. Stuff that is much worse that nuclear failures. And lets not talk about the destruction of human and animal habitat to make dams in the first place...
True, but we already have quite a lot of them, and we’re not going to remove them all immediately.
Most places already have built dams where there is any significant economic value. The only big new ones tend to be in newly developing areas.
So not much opportunity to expand there.
Also worth pointing out that a large fraction of the world’s population lives in places where seasonal storage is not nearly as much of a problem. Seasonal storage is much more of an issue for cool temperate and subarctic zones in the northern hemisphere, where maximum energy demand and minimum solar energy supply occur at the same time. Several billion people across South Asia, south-east Asia, most of South America, Oceania, and most of Africa don’t have this unfortunate misalignment.