"Will there be a WWIII?"
Think of what "world war" - the phrase suggests. It suggests that every government on this planet will be fighting battles with some other nation at the same time.
Has there ever really been a "world war?"
Look at this map: Map of current wars through May 14 2014:
Wars in the World » Map Ongoing Conflicts
Why isn't this called a "world war?" There are dozens of nations in battles now. Probably more nations involved in war than in the 1940s.
Aside from this
262 million people have been killed by governments in the 20th century (linky:
20th Century Democide )