World War III isn't going to happen any time soon, it's not worth worrying about. There are flashpoints for potential major regional wars, but not a world war...
You
do understand "world wars" are nothing more than major, simultaneous but independent, regional wars which happen to be waged by the same belligerents, right? That two of them -- as there have been more, and the spat between 1914-1918 wasn't even the first -- are subject to heavy romanticism is the biggest red herring in pop history.
But if you start considering them for what they were rather than how they're perceived by the cultural zeitgeist, you might begin seeing the context of those wars and the causal links between each. Otherwise, well, you're left with things like...
I don't really get this fascination people have with dreaming up World War III scenarios. It perhaps made sense in the Cold War, but the world has moved on.
...how you, without a shred of irony or self-awareness, cited as examples three regional flashpoints that exist specifically thanks to the Cold War and the world's outright refusal to move on from it, and go on to nakedly assert "the world has moved on" from the Cold War. That's some serious mental gymnastics, like straight "we've always been at war with Eastasia" shit, right there.
But I mean, it's not like the last few "world wars" were hallmarked with preoccupation with previous conflicts at cost of seeing the truth for what it is. Kind of like how in 1914, powers were preoccupied with preventing indecisive pitched battles, and ignored the impact of machine guns and contemporary artillery. Or how in 1939, powers were preoccupied with preventing trench warfare and ignored the impact of combined arms warfare and strategic bombing. Or how you're preoccupied with nuclear weapons, and ignoring the impact of asymmetric warfare as waged by non-state/state-sponsored actors.