Europe v. EU

I loved the bumper sticker - or rather back window sticker - I saw today while I was out on my walk. I forgot the exact wording because my brain is too overloaded right now, but the drift of it was Loving Europe, Hating the EU.

I've always been a fan of Europe, and I've had slightly negative feelings about the EU...not that my view on it is as relevant as people actually living in the middle of it. But now that I'm studying EU law & institutions, it is beginning to remind me of the ICC - all bark, no bite.

I just wonder how far this growing dissatisfaction will grow - enough to create big waves? What will happen if someone wants to pull out? It is set forth in a treaty, and signatories are supposed to be able to withdraw from a treaty, right? If one country pulls out, will others follow suit? And what happens if some country is in such a huge violation of EU law and doesn't pay the penalties against them *cough*Greece*cough* - if it gets really, really, really bad, can they kick someone out? That would be scandalous!