Quote from Specterx:
It's not necessary to posit this kind of ECB action to see how Greece will be forced to drop the Euro. If the flow of bailout money is stopped then the Greek government won't be able to pay for anything - salaries, procurement, pensions and other benefits, the military and police. The only options are to do triage and try to keep bare-bones essential services going - basically dismantle the entire post-WW2 welfare state and bureaucratic apparatus literally overnight - or drop out and print.
Greece has a primary surplus. Full default means they will have a fiscal surplus as well(not having to make interest payments), they won't need the bond market anymore. They can stop all the austerity