This is great news. It seemed likely that someone would do something along those lines sooner or later, but it's great that they did it.
Of course nobody expects the government to go to prison over this. However, compared to e.g. the US, Germany has very limited prosecutorial discretion. The Attorney General will have to answer for investigations that won't happen and charges that won't be brought. Yes, up to a point they can shut the whole investigation down in the name of national interest, but they would have to do so openly and on the record.
And they have to do all this in a way that won't expose them to a complaint to the Constitutional Court. Compared to the US Supreme Court that court is much less reluctant to get its hands dirty in political matters. That could fun to watch.