The moment the US breaks up into 50 sovereign states we can discuss again what a smart move that will be for the Americans
OK, let's start with a fact that the EU is NOT United States of Europe. The EU is NOT, and will never be, a federation. The latest German constitutional court ruling has proved that beyond any doubt.
The EU is only a politico-economic union which has insatiable appetite to swallow sovereignty of its members which is strongly opposed, especially by Poland and Hungary. And if we drop a "politico" from it it could have a bright future and be accepted by all the members and a form of free european market with no strings attached.