Of course they can.
China could call out the US on debt (essentially the economic nuke button)..BRICs are strong on resources and China has a lot of the commodities market already...the Fed is tapering off quantitative easing and in the fairly near future interest rates are going to rise...a lot of these countries are shifting away from the $ as the reserve currency and they have OPEC on lock. If China says fukk you to the US, calls out on debt and has the BRICs go to the Yuan...then they will have a stranglehold...
Remember how before the second gulf war, Saddam switched up by trading Iraqi oil in euro's rather than $$'s