The evolution of wind and solar plus storage is driven by economics. So current 50% growth rate is based on many use cases ready for wind solar storage. If there are improvements in price and performance of course the share of market will reach a steady state.
The progress is likely to continue, especially in energy storage and wind given the prototypes easily found on Internet search.
The really hard analysis is what the pace of technology evolution will be. For sure there is motivation to see a fast pace of progress away from fossil fuel. The fossil fuel profits are a risk to the west as Russia and Middle East Terrorists use oil profits against the West. Oil supply disruptions are also a risk to economies. So government support of technology development is strong. For investors they see $Trillion market opportunities to replace fossil fuels.
Do you think the spreadsheet models will change in 5 years? In 10?