The question being posed by events is whether there is enough of a sense of kinship among EU citizens for national governments to back the most radical of the burden-sharing plans proposed to rebuild the eurozone economy as one.
European has not much more emotional resonance as a self-description than “earthling” does.
We’re back with Adam Smith and the I bruise my finger and think it as, if not more, important than hundreds of millions of Chinee dying from some plague or pestilence. Somewhere between “me” and “everyone” my willingness to sacrifice for the sake of others vanishes. It also diminishes all along the spectrum towards that zero point. Me, children (possibly, for one’s own, reverse those two), family, clan, tribe, nation, etc.
Maybe that’s not the way it should be but that’s the way it is. And “fellow citizen of the European Union” as a motivator for sacrifice doesn’t really carry much weight.