Hundred percent correct. People joke as a way to quiet their own anxiety or pretend it doesn't exist.
Me, I am confident that sense will prevail. If sense doesn't prevail, self-interest due to oil and other resources will keep things from getting out of hand.
In either case, no WW3. There might be violence in Iraq and even Iran and it would be ghastly for the people on the ground -- but it won't sweep across the region any more than the existing violence in the Middle East already does.
RE: WWIII- Never pray for it jokers