We have solar supplemental to nimble natural gas plants and hydro for the simple reason the sun doesn't shine twenty four hours a day, seven days a week.
Solar merely delays the fossil fuel reckonings, and not by much.
Anyone who has lived in an off-grid solar home with a battery bank and a small fossil fuel generator will find themselves running the generator more than they expected, and they will very soon learn to loathe batteries. (Batteries are evil and capricious... ) These problems don't go away at scale. Solar must have 100% backup, and in today's economy that's nimble natural gas power plants even before any significant storage is considered. The same is true of wind. Solar and wind won't make any natural gas plants go away, and gas will replace coal with or without solar.
I live in a place where solar is growing rapidly. Schools and businesses are installing solar panels over their parking lots, there are electric cars parked in those lots being charged by the sun, and many of my neighbors already have solar on their roofs, most of them installed with various leasing schemes that may or may not prove beneficial to the homeowner... time will tell.
If we could tag individual electrons at the power plant, most of the electrons flowing through my home would be motivated by natural gas power plants, except for a few state-wide mild weather spring days in California when hydro and nuclear might dominate. For a few hours on sunny days I'm probably getting some power from my neighbor's solar panels, but I doubt our neighborhood is exporting power yet at any time, all that mid-day solar energy going to power refrigerators, freezers, and always-on electronic devices.
I won't begrudge my neighbors their solar panels, I simply believe social innovations are far more important than technology. How do we convince people that relaxed low energy lifestyles and small families are a good thing?
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