Nice parable, but the author has stacked the deck. The Blues and Greens were originally divided over the issue of the color of the sky. These groups then developed their own cultures and attitudes that had nothing to do with what they believed was the color of the sky, though they were thus identified. The world had evolved to a point that the Blues and Greens had developed mutual tolerance based on a deeper understanding of their common humanity. I suspect that in this new "secular" world, most people viewed the origins of their group name as fictive or ultimately unimportant and the news of the discovery of the True Color would not materially change their lives. The remaining Fundamentalists would, of course, respond in a variety of ways as outlined in the post and comments. It could get ugly but would probably not effect things too much. As the author notes, the discovery of a vast new world waiting to be exploited, would make the people see gold more than it would blue or green.