I do think that this current sluggish world war worse because it can last forever. The manifestations of Islamic terrorism is also an element of war. We don't know who to direct them. Maybe the guiding hand of terrorists in Europe is also located in Europe.
The real threat to World War comes from Islamic terrorists. The ISIS and its leader Abu Bakr al Baghdadi can get the nuclear weapons from Pakistan (where many members of the government sympathize with the Islamists). They can also get the short-range ballistic missiles from Yemen or the DPRK.