Yes, I think there is a good chance there will be a world war at some point in the next 5 billion years.
Another interesting question . . .. What group would have the 'gumption' to take on the 'gubment'? Rocket River
Another thing to remember is that chemical warfare is not that effective as weapon especially with WW2 or WW1 technology. Artillery & rockets tend to destroy a significant % of the chemical weapon and it's difficult to built up lethal concentration (multiple rockets, artillery, bombs have to hit the same spot in a short period of time,, something that's very difficult to achieve without precision guided munition) Chemical weapons were more effective during WW1 due to trench warfare.