Serbia wants to go into the EU because it has not other alternative. And there reason there is no alternative is because the breakup of Yugoslavia was orchestrated in such a way that the republics could never reunite. After the fall of communism in the USSR, the powers that be didn't want another socialist country to remain in Europe. But more than that, even if Yugoslavia managed to transition to a market economy while remaining a federation, the existence of Yugoslavia might have made countries like Bulgaria, Romania, and even Hungary, Belarus, and Moldova more eager to enter into some kind of a "southeast european block" than pursue a tough shock doctrine course of EU integration.

The EU will not survive the next 100 years. The countries are too different and the cultural and ideological faults are already exposed.