I would say that you're exactly correct, when you say that the EU can never lead to a successful federal bloc. The EU is not a federation, no matter what kind of nicknames one invents for it. EU citizens and member states don't want it to be a federation (some do of course, but they are probably fewer than the people calling for the EU to be disbanded entirely).

It's pointless to compare EU to USA. They are not the same, they were never meant to be the same, and no one wants them to became the same.