Decline in leadership- what next?

When your leadership role decines, and this seems inevitable, what do you do? Try to postpone the inevitable; try to prevent it through eliminating the competition; accept the decline and manage it to your own benefit or are there other options?

Some could argue the USA faces this option in the next 20-30 years. As sure as people cannot live forever, empires cannot live forever and the USA will need to sacrifice its individual dominance of the World at some point -maybe to China, maybe to China and India combined, or maybe it will just have to share its dominance with either of those (or Europe etc)?

Previous empires have tended to implode through over-stretching or because the competition beat them (often in a group) or because someone else just developed to be better.

Let me introduce: The Project for the New American Century is a non-profit educational organization dedicated to a few fundamental propositions: that American leadership is good both for America and for the world; and that such leadership requires military strength, diplomatic energy and commitment to moral principle. Now this seems to imply that the USA will not give up its leadership position.

Fair enough -let PNAC research this (and who knows how much support it actually has from the 'powers that be'. But what would be better for the USA is to also have another think-tank entitled: Project for the Non-American Century which could explore what the future might look like under a different country (or group of countries)'s leadership. It could explore what the US could do to ensure it still benefits from this decline, how to deal with the psychological implications, how to prevent a nuclear attack on the (overtaking) competition and so on.

Even more interesting it could explore peaceful means of how the US could retain its leadership role in a way that is good for itself and others; in partnership with others. Unfortunately political international partnerships (e.g UN) rarely work due to the inherent fundamental need to preserve one's self-interest over all else... simple game theory does not adequately explain irrationality based on human kind's selfishness; or if it does (I am not an expert) then why has no one put forward suggestions to make partnerships like the UN Security Council or WTO work better?

The Leadership of the US needs to be responsible to itself and to others by creating several scenarios of the future and explore each one in detail. Instead of just presuming there is only 1 possible scenario (continued dominance) and exploring how to best ensure that scenario happens. As we are slowly, slowly realising we are an interconnected species on a small planet (witness climate change) and we have to put the 'whole' ahead of ourselves. Other species seem to be able to do this. Are human beings up to the task?

I would hate to see yet another cold war of some king... one that might end up warming up just a little too much..