I agree it is much too short, but I think we need a good solid baby boom before we will take arms in the near future.
I was also thinking that economics and not war are behind the spread of the English language. You could argue that movies (culture) also cause people to learn a language, but the movies are coming from the place that has the money and industry to make them.
The effect of nukes not withstanding, I think 66 years is too short of a history to say that "total war" has gone out of fashion.