The exit of Greece from the euro zone by choice or happenstance might have caused ripples but not disaster for the currency union. By contrast, the exit of Spain, with the fourth largest GDP in the euro zone, would be catastrophic, the end of the single currency and perhaps the European Union in its present form. The German government and its austerity allies could not threaten an anti-austerity Spanish government as they did Syriza.
If Greek citizens vote in a government that repudiates austerity and wants to re-negotiated the public debt, who might be next - Estonia (election 1 March this year), Finland (19 April), and/or Spain (20 December)?
There is an authoritarian trend in Europe. The neoliberal inspired market deregulation has been the destroyer of freedom, as it is shown by the weakening of the power of trade unions and other popular organizations.