Oddly - European nations that don't use the Euro are generally much better off: Norway (though not EU), Denmark, Sweden, UK.
In hindsight, the UK's decision to not join the Euro is widely accepted as smart.
The Euro is effectively a 'hard Germany currency' that has entrapped the periphery of Europe into a monetary system that massively favours the Germans. Maybe it could have worked out - but from 2000-ish to 2008 - world bankers assumed the Euro meant 'collective risk pooling' so the periphery countries loaded up on cheap debt. But when the crash happened - we discovered there were going to be no bailouts - leaving the periphery with a massive balance sheet problem, and the total inability to manage monetary policy - or rather - they're stuck on a 'strict currency' which favours Germany who already had several advantages.
But I agree, if Scotland does go indy, then it may very well introduce a pegged currency, which makes sense as something temporary.