Sis, I am generally sympathetic to Greece's position. As it stands, the country's debt is practically unsustainable and no long-term solution will be viable without some form of restructuring (e.g. a partial reduction of the debt). Most economists now agree on this point, cuzs uch a step would be by far the lesser evil for Greece as well as its creditors if the alternative is continued stagnation in Greece or its outright expulsion from the eurozone.
A preposition like that is simply not on the table right now and it won't be in upcoming weeks tho. Politically, a move like that is virtually not-doable in the short term. Countries such as Germany are not willing to budge on this point and the way Syriza has alienated virtually all of the parties whose help Greece now needs has only strengthened their opponents.
In other words, Greece will almost certainly not be offered a deal that is significantly better than the one they have voted on today. If the result is No, then Greece has effectively voted to leave the Eurozone as multiple European leaders have made clear.
What is unfortunate is that many Greeks who have voted No have not fully grasped this point as they have been lead to believe by Syriza that by refusing the offer of its creditors, Greece will be able to remain in the Eurozone and to avoid more austerity. This is simply
delusional.
If the answer truly is No and Greece refuses to accept the help of its creditors at the conditions already offered, it will certainly become insolvent. The short-to-mid term effects of such a move will simply be tragic for Greece, including further economic contraction, greater joblessness and a loss of people's savings. Such a situation will be far more painful for Greece even compared to the sorry state under which Greeks suffer at present.
However, by the time the same Greeks who today voted No will understand the full, painful effects of this vote it will be too late to go back. Just the way it is.