a more likely scenario ( although still unlikely ) is in the event of ireland withdrawing from the euro , all savings held in this state would adopt the value of our new currency
A rather simplistic view I would suggest! In the unlikely event of such a thing happening, I would suggest that you can also expect other Euro countries such as Germany taking steps to protect their currency by requiring all non resident deposits in their banks be converted as well, otherwise the flight of capital we hear about would a major impact on their currency.
Jim.