There will be no WW3 anytime soon or at all, tho countries are pretty much at war right now but in a different way, destabilizing the economy and it's government is how you defeat the country and win the war. We're in a tech era, wars have changed now.
It doesn't matter how the war is fought, war is and always will be war. With new technology war evolves, and some countries with better tech can use it against other country. But what happens when tech and electronic way of war is not efficient? They would need to enter other countries territory, and in that moment war is what it always was... because "The war, war never change us" . 
War is war, but today's war is done with a lot less casualties (as in death casualties).
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But what happens when tech and electronic way of war is not efficient?
It hardly cannot be efficient since all countries use computers now days and network to monitor everything from prices, market, economy, etc... Today only time force will/should be applied is to another force. .When the countries aren't developed, just as NK, then they can respond only with force and as I said, respond with force only to another force. Tho, NK has the tech power and a team of hackers, every country does, maybe some african country doesn't. Well tcyber power isn't always necessary to bring one countries economy down, simple sanctions can do just as well.
