Solar and wind are better alternatives today. They got developed to the point they are because of those same smart, sensible Germans investing in them early on.
Principally nuclear countries like Finland, France, and Sweden produce a kWh of power with 5x-20x less carbon emissions. The figures are even better in countries relying more on hydro energy.
The nuclear waste is a real problem, but a nearly inconsequential one compared to global warming and carbon emissions from coal and natural gas. We have geological storage and reprocessing methods for nuclear waste. Fast Breeder Reactors and Molten Salt Reactors can consume what's considered nuclear waste and the latter can produce short-lived waste (dangerous for 300 years instead of thousands), which we can definitely store.
The biggest challenges for nuclear reactors are political, both because people are against the reactors as they were unsafe/used for WMD production in the past, and because having nuclear energy tips the energy and power balance (countries like Russia would rather see Europe depending on their energy). The engineering and safety challenges are irrelevant in comparison.
… doesn't in any way change the fact that Germany has indeed been massively investing in renewable energies and has built up enormous capacities in that domain that account for a much higher percentage of renewables in the energy mix than the overwhelming majority of developed countries… and that those early and continuous massive investments by Germany have played a major role in bringing these renewable energies to the much improved viability, maturity and price level they now have.
There is no contradiction between those two facts.
https://ourworldindata.org/grapher/co2-emissions-and-gdp-per...
https://ourworldindata.org/grapher/co2-emissions-and-gdp-per...
And, apart from a covid blip, generally looks positive for most economies, and France and Germany don't seem much different, despite the differences in their electricity production.
Another view on similar data:
https://ourworldindata.org/grapher/co2-intensity?tab=chart&t...
Such ban would go well in hand with the decision to phase out cars that run on fossil fuels in 2035.
YOu understand that Germany has been investing into wind and solar for decades by now and it's still extremely far from meeting its energy production goals, even though you wind farms everywhere in the country when you drive there? That should tell you something about the viability of this initiative.