The issue to be posed is not whether the next century, or millenium, will be riddled with instability as a cause of a debilitated US hegmony, but how conservative America believes it can prevent the inevitable transformation from a pro-American world of the 20th century, to an anti-American world of the 21st.
Two administrations of the neocons in power have allowed us to see that far from preventing the transformation, they have actually accelerated it and, consequently, have, in spite of all their military efforts, also paved the way for a more daring show of presence against US interests within the international arena (China, Iran, Russia, South America, etc.). Their political agenda is only destined to exacerbate the phenomenon, as if the more the US believes it can move unilaterally as national convenience suggests, the more growing hostility its foreign adversaries will pose. As if the ferociousness of the open challenge to US interests, is directly proportional to the arrogant supposition that the nation can mold the world to its own liking and as convenience presents itself. The ideology of "exporting democracy" to veil a forced imperialism is only the most cogent example of the fallacy of such an approach within the international order.
Consequently the hawkish line to dealing with the US power crisis, for that is what it amounts to, in Afghanestan and Iraq - also due to the hypocritical US approach in the regions - has proven to be pathetically unproductive, just as the exhorbitant costs will prevent home economic growth for US generations to come.
And all this, I might add, in the interests of the few conservitive and occultists powers of the military-industrial-finacial block and the tools of the system that vote for their political ideologues, who belive that the world is thiers to do with as they see fit.
A liberal force in power is simply a return to reallity and, ironically, despite the utopian criticism of its ideology of a mulitilateral world in relative political harmony, a return to what's possible. Given that the supposed neocon "possibility" that the globe could be somehow forced into compliance with the US through brute military and economic leverage, has turned out to be, following the nature of multiparty relationships, simply impossible.