What are you smoking and do you have any idea what that would do to the US economy? That threat will work about as well as when the US told everyone not to trade with Iran...so US firms lost their 6% which was taken up by the Europeans as they where laughing quite hard.
When the threat is backed up by the US Navy announcing unrestricted submarine warfare on all ships in the South China Sea, and the US Government seizing all assets and real properties owned by Euro-peons...it'll stick. We just weren't willing to tell the Euros to stuff it back in 1980. We are now.