I do not see any world wars happening anytime soon either, given a somewhat rational (read non-suicidal) leadership of key nations. The original comment you responded to said that none would survive a nuclear total war, to which you replied that there have been wars fought in the nuclear age. This is true, even to the point of proxy wars between nuclear powers. However, they are not world wars, for which I think the original comment's argument holds true. In effect the idea is that a world war would almost by definition have some nuclear power on either side.