I hope, we will newer know about it )
I too think this situation may not ever arise.
War cannot prove its worthiness in current time as it's cost is higher than the benefits.
Most of us doesn't want human catastrophe to happen again. But war is inevitable for there are giant nations and multinational companies that are producing weapons that may annihilate mankind massively. So whether china or u.s. will win the war only time could tell, but for me the whole human race will become victim and looser if war may transpire.