I can remember one guy in the small village I grew up: He put solar on his roof already in 1991 - the people where laughing at him. (and back then you got nice state subsidies to do so). Today its a nobrainer - so for me its clear: It depends on the mindset of the society if those things are funded or not
By 1991, France already generated nearly 80% of its electricity from nuclear. Pointing to the falling cost of solar today overlooks the fact that nuclear would have allowed a massive decarbonization of the developed world two generations ago. France couldn't have done that with solar back then. The current feasibility of solar and wind is the result of fundamental scientific advances in semiconductors and batteries that didn't happen until the early 2000s.
Remember, CO2 is a cumulative problem. Massive CO2 emissions reductions from solar/wind in 2026 are a lot less valuable than the massive CO2 emissions reductions we could have had using nuclear 40-50 years ago.
There is a more straightforward counterfactual. If the hippies had just sat the fuck down and the developed countries had nuclearized their grid the way France did, CO2 emissions would be so much lower that we could afford to have the entire developing world increase its CO2 emissions up to the French level while remaining within the same total global emissions level as today. And we would have had a huge runway for further decarbonizing our economies because we could have done all that by the 1980s like France did.