People tend to forget that while gas is being used for energy production, it is also being used as basis of chemical processes, e.g. for ammonia production, which then starts a whole chain of products (most prominently: carbonic acid, fertilizer, cooling, removing CO2 from industrial exhaust, ...)
We can't just replace natural gas with nuclear power, even if we did, we'd still be in deep trouble.
I know. In our state we're very pro-nuclear and the local Green party basically ended itself over this issue. I used to think that's surely going to happen in Germany too - such a scientific, rational and pragmatic nation/state, right? But oh well, seems like economical pragmatism wins over ecology and health.