The End of the UN is coming. And it'll be much sooner and much more brutal than most people expect.
Even those who've been predicting the demise of the UN seem to expect that it will fade into irrelevance. The weasel-bloc nations are betting that Bush willl just ignore the UN for the remainder of his current term, and that his replacement (in two years) will be eager to get back in the good graces of the UN. Even if Bush "temporarily" withdraws, they'll spin it as a fit of pique, batten down the hatches, and wait for his replacement. Two years of irrelevance is a small price to pay for the glory they've received, and the light at the end of a tunnel is an American President who will suck up to Europe like no one ever has.
They've seriously misread the situation.
Bush will not simply ignore the UN for the remainder of his term. He's a bit focused on Iraq at the moment, but once he turns his attention to the UN, he will systematically discredit and dismantle it to the best of his ability. And he'll be turning his attention to the UN very soon.
France and her followers have worked very hard to wring the maximum benefit out of the standoff at the UN. In the process, they've placed the credibility of the UN in direct opposition to that of the US, which means that the only way for President Bush to regain credibility is to trash the UN.
But that's actually secondary. Their real mistake was to demonstrate in no uncertain terms that the UN in its current form is a clear and present threat to the security of the United States as Bush sees it, and President Bush has made it very clear that he sees it as his duty to eliminate threats to the United States. Dominique de Villepin might as well have painted a giant bullseye on the side of the UN building.
The attack on the UN will begin at about the same time as the attack on Iraq, on the theory that its better to take the worst of the PR damage all at once. In the first salvo, Bush will publicly flay the UN and directly take on the weasels in the statesmanlike speech his supporters have been waiting for (which might be the speech that announces the start of hostilities in Iraq). He may well also "temporarily" withdraw from the UN but I don't think we'll see a joint walkout just yet, and Bush will probably offer to work with other nations to "reform the UN into an effective body." This last bit is primarily for Tony Blair's domestic benefit, and the UK will take the lead on proposing ways to reform the UN. None of them will work, but it's a PR exercise so that's beside the point.
In the medium to long term, the best and most effective weapon Bush will have against the UN any time soon is Iraq itself. Handled properly, his greatest liability can become his strongest asset. The war will be waged with exquisite concern for civilian casualties and the postwar peace should be managed cleanly, transparently and with extraordinary generosity toward the people of Iraq. And look for a PR campaign emanating from Iraq itself, aimed directly at those who supported Saddam - every hidden weapon and every atrocity that is uncovered in Iraq will be laid directly on France's doorstep.
If Iraq plays out as expected and world opinion calms down enough that Blair (and Bush) are feeling secure again, they'll decide that the UN is beyond hope and propose a complete replacement -- one built from the ground up to promote freedom in a unipolar world (Evan Coyne Mahoney's Alliance of Liberty is a pretty good template). The new entity might even arise from the reconstruction of Iraq itself, which will be run by (mostly) non-UN multinational entities and via non-UN multilateral agreements (ad-hoc coalitions of the willing, able and trustworthy).
Bush might surprise me and go straight to a replacement for the UN, but it seems like that would be too much for Tony Blair to survive right now and Bush won't sacrifice him. Bush values loyalty and knows that it goes both ways, and he understands that Tony Blair is essential for the next stages in Bush's project to make the world a safer place.
Update: I really have to remember to read USS Clueless before I sit down to write. Steven Den Beste is on the same wavelength.
Update: Andrew at Pathetic Earthlings wrote about possible non-UN multilateral administration of Iraq several weeks ago. I'll admit that the notion of France lobbying Poland has a certain appeal, but it's unlikely -- effectiveness is primary, and whatever structures emerge can't even appear to have been designed to retaliate against France. The new Iraqi government, on the other hand, can do whatever it wants.