The EU will be a super-power one day, of that I'm sure. But not any time soon - there are alot of old wounds that are still in the process of healing. Maybe it would take a civil war to bring a union together, but maybe not. Either way, the scale of the endeavour is unparalleled in human history. The US took a long time to integrate, even though the constituent states had virtually no history. The European nations have milennia of hatreds and prejudices to smooth over - and that will take a whole heap of time.