I also agree. I don't expect this to stand very long. Either there will be some ruling higher up (European Court) or some legislative action. I'd like to hear the thoughts of someone familiar with the German legal process on what we might expect next though.
From what I read:
The accused doctor was not found guilty - the reasoning being that even though the procedure was found to be a violating of the child's rights, the doctor could not have known this.
The prosecution could appeal - but that is unlikely, because the reasoning is legal and sound. It is nearly impossible that a higher court would convict the doctor.
Nothing will happen now.
Eventually, some other boy will be hurt eventually, and then someone else will find themselves in court. Possibly, another doctor. Or the parents of that child.
Then it would be possible to find them guilty, because now they'd have a chance to know what the first ruling was. In the case of a doctor it might be considered his due diligence to know, even.
The next court can decide either way, really - it is not bound by the verdict of the regional court that made the first ruling. So, it will take some other court to reach the same verdict, and then a chain of appeals that might go up to the European Court of Human Rights at the highest instance.
Whatever it ends up being though, the discussions and chatter that this action has generated are the real benefit. Few in the US, for example, know that non-therapeutic (secular) circumcision is a relatively rare outside of the US and just getting that information out is helpful. Interestingly, the Dutch Medical Association is holding a symposium on this matter this week. It's focused on the questions addressed by this ruling.
As always, it will take a while for things to change. Some odd 15 years ago, gay marriage was virtually unheard of as a real thing. Now, countries are slowly adopting it and more and more those opposing it find themselves in the minority.
This is going to be the same thing, and hopefully, it'll be a bit quicker.