That depends on what EU governments do to collect. Greece owes 240b euros. If the EU insists on collecting by seizing all Greek assets and imports and banning all travel to Greece until it pays up, the country immediately becomes Bangladesh with nice beaches. Economically-speaking, the Greek parties on offer ranged between hard left, and really hard left. Syriza is the latter. Not surprisingly, this reflects the sentiments of the populace:
The degree of radical change Syriza can introduce even with an absolute majority will be limited by its lack of money and the unwillingness of 75 per cent of Greeks to leave the euro because a return to the drachma is not really feasible. Greece imports most of its needs and has no important allies in its confrontation with the EU. On the other hand, as the first radical-left government in Europe for decades, it will fight very hard to show that it can deliver on its promises to give free electricity to those cut off, provide food stamps for children, provide healthcare to the uninsured, provide accommodation to the homeless and raise the minimum wage from under 500 a month to 750.
Even a minimal welfare state will be hard to fund due to the lack of cash.
Realistically both the EU and the new incoming Syriza government have very few options. The EU wants to be repaid, and Greece wants the leash loosened so it can stimulate its economy.
Finding the right formula to do that is the next stage of this long-running drama.