the pain and turmoil will be unbearable in those countries

It is unbearable for most of the population in (say) Greece, and getting worse. People are out of government, financial services because of debt, tax issues - they are just "lucky" that the state cannot handle them all. So they enjoy a cup of coffee per day on a primitive day to day living.

Euro exit would be a big difference for those who still have office (etc) jobs, do good business on touristic spots. They rely on the government to keep the status quo (including the turmoil threat).