It just was never going to work. A currency Union involving countries as diverse as Greece and Germany could never work. Their economies, in terms of wealth, size and composition were just too different. Those who bravely made the case that Britain's prosperous future lay with retaining its own currency were derided as inwards looking and backwards, much as many who want to see Britain take back control of its democracy from Brussels still are today.
The longer the Euro limps on, the worst the catastrophic fallout will be. If Greece and later Portugal and Italy left now it would be damaging. Very damaging. But that is no reason to argue against them taking off the shackles of Eurozone membership if the alternative is to carry on and succumb to an even worse fallout later.
Now is not the time to hope against hope that countries like Greece that have been devastated by false promises and bungling idealistic pro-EU politicians somehow cling on inside the Eurozone. The Euro's inevitable judgement day is fast approaching. It will be the EU itself which is next.