Another dirty little secret is that the rapid advances in efficiency and cost effectiveness of both wind and solar are coming to an end, as they approach their hard physical limits.
A fundamental physics problem. Theoretical limits.
They have a little further to improve, but the large and easy gains are already behind us.
They will likely never be truly cost competitive for most applications, when you look at lifecycle total cost of ownership, without subsidies.
Great for off the grid applications, like sailboats, or outer space.
Boy I wished they still taught that in school...
The other major issue that will likely make or break wind and solar is energy storage. Neither works 24-7. Both need a way to store energy for the times when they aren't producing. We have nothing even close to sufficient to store the energy from even a moderate solar far.
Whoever invents that storage system will hopefully become some very wealthy folks.
(Same for the enterprising engineers who hopefully someday soon find a more cost-effective way to extract oil from oil sands... making Canada more important than Saudi Arabia on the global scene.)