The Euro - Time to re-open the debate?

I have just listened to an interview of Radio 4 (details to follow as soon as i can get hold of them) on the subject the Euro. Ten years on is it time to reopen the debate? I would say yes, i know that there is little chance of the UK adopting the euro in the short term but with Iceland, Sweden and Denmark all looking to join isn't the UK and its pound becoming dangerously isolated?