This must be one of the positive consequence of adopting European union's recent money laundering directives. It seems as per those directives, German laws now may start supporting cryptos as an asset. Still, European countries are not ready to declare bitcoin as a legal tender like how Japan did some 3 years back itself. I believe Swiss government may do that first among Europe countries.
The German banks have the permission to sell and hold bitcoin but i cannot find any by law that says it will be considered as a legal tender, it might be considered as a commodity and if the government gives the permission to use bitcoin as a legal tender then it will be a huge news for the market and it will reflect in the market and i am still waiting for more news about the recent development.
Don't do things like this will affect to the price of German's currency, i mean since Bitcoin was okay to be traded and German banks granted the permission, those people who want to enter the crypto should sell their cash and put it into BTC. Let say government become neutral about this, but if they suddenly make the law to forbid it, it can cause problem for them who already doing it.