

Their real fear is that their electric car won’t take them the 1500km to their holiday destination, without any stops, with a caravan in tow, which they will do once per year.
And they can do that with fast charging and there are enough fast chargers. This fear is going to go away, as friends and family members buy EVs. The sales numbers are pretty good and prices for EVs are falling, so this is probably going to happen in a lot of cases. Especially with “cheap” German branded EVs like the VW ID.Polo and new subsidies. Germany is past the early adopter phase for EVs and in the early mass market phase already.
That is going to take years. Petrol stations already have the infrastructure and mostly make their money from the small store and not selling petrol. Germany and most of Europe are densly populated, so refineries shutting down, is not going to cause that much of a logistics problem either. Sweden and Finland might see that happen though, due to being less densly populated.
It would require a massive drop in ICE cars on the road to increase petrol prices in a country like Germany. I very much doubt it is going to happen in the coming decade.