Um, I don't think Egypt leaving the wider Internet shows that international cooperation always works well. I'm sure that the US isn't happy that they did that. Rather, it proves that the Internet is a patchwork of national networks and governments will get the last say, no matter what the international community thinks.
The WTO's powers are not what you seem to think. It's not like the WTO can give marching orders Hu Jintao or Barack Obama. Rather, the WTO is sort of a forum for nations to talk to each other. Both China and the US, and a lot of other countries, have anti-free trade policies that the WTO is powerless to change. For example, the US gives tons of subsidies to farmers, who then use it to undercut farmers in the third world. China keeps its currency artificially cheap to pump up exports, and tends not to enforce any intellectual property laws at all (unless the owner of said property is Chinese.)
Or think about the 2010 United Nations convention on climate change. China and India basically refused to agree to any greenhouse reductions at all. With the greatest possible tact and diplomacy, they said "screw you." China builds a new coal-fired power plant every day and has no plans to slow.
International cooperation may work in the case of the IPv6 transition. Then again, it may not. Time will tell.