I'm sure that everyone has learnt a lot from history, and there will never be another arms war ever again. I guarantee that if WW3 does happen, it won't be called WW3 as there won't be much physical destruction.
If a real war ever does break out, it would be a cyberwar. The moment the quantum computer breakthrough happens, systems everywhere will collapse in seconds and that will be true war.
So, nope. No real war anytime soon.