After all, every oil-endowed country will have to seek markets in the industrial west, or all their grand schemes cannot be funded. And if at the end of the day, it really gets out of hand, then we will have the time and means then to deal with it, since the problem will never rise to such a level that it really threatens our very existence. These are rather persuasive. But to me, the most important issue is Leadership. Nations that think they can opt out don't last long to talk about it, especially great powers who somehow imagine that the world will let them be.
Power stands at the heart of leadership.
It has many aspects but only a few are material. Intellectual influence and credibility are essential. And that means two things. If, because you imagine you can opt out from your role as global power, you either abandon your friends or let your enemies triumph, then you will find your global influence slip rapidly from your fingers. Indeed, at first you may see cautious intellectual sniping at your country from enemies around the world.