if there was a ww1,ww2, and possibly a ww3 then maybe there will be a crisis and ww4 may actually happen if we are lucky there may not be a ww4 but all we have to do is prepare for the future.
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Albert Einstein said something to the effect that he didn't know what the Third World War would be fought with, but the fourth would be fought with stones, implying that a Third World War would be the one which took humanity back to a more primitive age.
So far there are only two acknowledged world wars, those being WW I and WW II. It would be possible to classify the Cold War as WW III if you want to (although that is not generally done) and if we do that, then we might as well classify the War on Terror as WW IV. The world is already involved in a global conflict; whether we choose to call it a world war is up to us.
There will be no world war 4. The next war will be all nuked in the war before this one ever comes. Unless it is with Aliens, who will kick our asses