In other words, Germany could cut at least 75% of their NG consumption, which is pretty significant.
This link describes how even the ammonia can be produced from hydrogen, which in turn can be produced from electricity (solar, nuclear, wind, take your pick):
Germany can do that maybe by 2040. Retrofitting every home in Germany to do away with gas heating and implement efficient electrical heating is easier said than done, to put it lightly. We're talking trillions in euros worth of investment and spending.
If electricity doesn't come down enough in price, I fear it will take a lot longer than 2040. IF the price of electricity can be brought down below the price of natural gas per unit of energy, many use cases (the low hanging fruits) can be replaced relatively quickly.
Over the last couple of decades, though, the electricity price in Germany seems to have risen sharply, even when not including the last year.
It seems to me that many of the energy related policies in many countries have been focusing way to much on symbolism, instead of minimizing the price while also limiting actual harm to the population and the environment as much as possible. And when the price of electricity doesn't come down, consumers want to use it for as few things as possible.
And the first step is to have a realistic plan to make electricity as cheap and abundant as possible, as soon as possible, while still minimizing pollution.
Also, every step helps. If we cut consumption in half, we halve the rate of global warming (at least). It's not like its all-or-nothing.