Electricity is getting more complex to hold up every year. Europe is a supranational network, and the chance for a blackout is growing every year as well.
If ever, it surely won't look like a collapse of a unified society. I think you are crying wolf really...
Wait for the next Lehman event. The collapse will undoubtedly be a global one in a globalized society. The USA is not working anymore without China et vice versa. A Bankrun, and the whole society comes to a stand still.
China is surely not as dependent on the USA as the latter on the former. Even if the USA disappeared entirely one day, China would go on. And Europe is not dependent on either. Actually, it is more dependent on Russia and their natural resources. In short, I don't see how the whole world could collapse all at once, unless there is some disaster by natural causes...