Obviously if you will rely on wind or solar for baseline, you will need to build out storage. And, equally obviously, you don't waste money building out storage you don't yet have capacity to charge up.
It is a trivial observation that adds no light.
What is known now is that costs are falling even faster than did solar and wind, and are already of similar order.
If Russia stops delivering gas, then ultimately that will translate to a higher German oil demand, as a lot of formerly gas tailored usage will be retooled to oil.
As Russia is sitting on the single largest gas supply on the planet, nearly a quarter of the worlds supply [2]. While with oil there are a few somewhat competitive non-Russian alternatives [3]
So if Russia's resources will continue to be geopolitically taboo, then a lot of Europe will shift back to oil instead of gas.
[0] https://www.energy.gov/sites/prod/files/2019/11/f68/Products...
[1] https://data.worldbank.org/indicator/NV.IND.MANF.ZS?location...
[2] https://www.worldometers.info/gas/gas-reserves-by-country/
[3] https://www.worldometers.info/gas/oil-reserves-by-country/
The nuclear plants they shut down were a drop in the bucket compared to gas, solar and wind.
So they need to either build a lot of nuclear or build a lot of wind.
One of these is cheap, easy and fast, one is hard, expensive and slow.
3-4 years of German rollout of onshore wind would probably do the job.