You're wrong, EU is strong entity. It's just that it allows a bit too much freedom to its citizens and because of that loud minority and extremists seem as a bigger force then they actually are. I was part of a country with similar organization (federation) which fell apart due to foreign influence. It was perfectly capable to deal with domestic "terrorists" and traitors. Hell, we even sent professional killers all over the world to eliminate those nationalists who fled the country after WWII (in USA they call them dissidents). Sadly, some of those assholes survived and spread there families and now came back to fuck us in the ass.
What do you think would happen to an American who would try to undermine USA and try to restore Dixieland? I mean for real, not some loudmouth who justs talks and does nothing. He would be labeled as terrorist and immediately arrested and tried for treason. Same would happen in any other federal country.
Even Brussels would do that if certain forces that are minority (less then 10% of voters) try to dissolve EU. They will be dealt in some way, not necessarily killed but there are ways. You can bark all you like but you can't stop EU train from going forward.
EU doesn't exist so you fuckers can hug each other and sing love songs. It exists because European countries were devastated after WWII and were susceptible to outside forces such as USA and Soviet Union. Europe choose to ally with lesser evil at that time but after recent events (USA treating EU like they own them), bet that love affair won't last for long.
Switzerland and Norway will be forced to join EU, mark my words.