That makes sense if PV deployment is limited by supply. But the solar industry is currently limited by demand. You can see it in market news for solar components:
"Wafer prices stable-to-soft on market oversupply"
I thought building new solar plants was cheaper than operating existing gas and coal plants. What’s hold up on building solar capacity as fast as we can, saturating demand? Permitting? Capital deployment in utility markets?
In the United States, I think that permitting, interconnection queue backlogs [1], and political efforts to protect legacy coal against cheaper competition [2] are the biggest obstacles.
It's not a replacement for the cost of operating existing gas and coal plants; building up new solar capacity enables you to burn less gas or coal at the times when the sun is shining and thus cut its fuel costs, but it does not enable you to shut down the plant and cut any its other operating costs, because you still need the same capacity for e.g. winter evenings when at peak daily consumption there is zero sunlight.