I didn't say or, I think, even imply that "any metaphor will do". And I'm also not saying that war doesn't exist, or that dancing will somehow replace war.
I said "it's certainly possible to use different metaphors to describe or model the same situation." Then I described some situations where dance, not war or physical conflict, is used to settle disagreements.
It's by no means obvious that "any metaphor will do," which seems to be your point.
And all cultures have war. There are zero cultures that have replaced war with dancing and there's no reason to think this is possible.