The ECB let them keep their current lifeline for a few more days, but it looks like it's still not sure yet whether the banks will open. (which means they probably wont - see above).
http://www.bloomberg.com/news/articles/2015-06-28/running-ou...
edit: updated with the fact that the current emergency aid from the ECB might not be enough to keep the banks open.
He can just say "See you all decided not me."
We have all of these safeguards in place to ensure our leaders neither go off the rails completely, nor simply follow the popular opinion du jour with the predictable disastrous consequences.
If we would do that in the rest of Europe, aid to Greece would have stopped a long time ago.
However in reality it is no decision because without EU membership there is no money anyway so austerity is happening to Greece one way or another.
A large portion of the Greek people recognizes this for what it is: an extremely cowardly opt-out for Tsipras for taking responsibility