While it never seems to die as a political issue how likely is a NPD ever to occur anyway (or a ban of any other political party for that matter)?
The only two successful party bans conducted under the
Grundgesetz happened almost sixty years and it was an entirely different country back then. The SRP was banned because it consisted of Nazis (actual Nazis, not neo-Nazis) and the West German government wanted to prove to the Western allies how serious they were about preventing the rise of another Hitleresque regime. Four years later, the KPD was banned to prove that West Germany is not only tough against Nazis but also against the Soviets, which was an important point to make at the height of the Cold War for some reason.
Diplomatic relations with Israel are currently as good as ever, so what would be the actual incentive of banning the NPD here? Could calling for a NPD ban be the German equivalent to America's flag burning amendment that never materializes?
