Taleb's "black swan" is by definition not a repeatable -- or even predictable -- event. The metaphor loses all novel meaning if stripped of that quality.
For reference the definition is, "an unpredictable or unforeseen event, typically one with extreme consequences." Let's take truly great works of art as an analog to black swans. I agree you cannot create a formula for churning out more great art, as one struck in a certain direction reduces the greatness and significance of others in that direction. But if some wealthy patron collected a bulk of the worlds great artists, giving them creative freedom, tools and space... I cannot say for sure it would result in more "great art" than would be produced otherwise. But I would not say it's impossible by definition, as you do.