Some very stupid and unlikely things would have to happen on this planet for WW3 to happen.

Like if Iran or North Korea uses nukes against anyone, they would be immidiately raped by the world. If China invaded Taiwan then no one is going to respond with all-out war just to save an island.

So even if the current crisis get out of control, we are still far from a world war.

I think the US/allies vs. assorted Muslim countries is the closest anyone is going to get.

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"The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself. " — John Stuart Mill