Earlier quoted context omitted.
"the UK won't let Scotland use the pound" was an extremely effective argument that probably won the last referendum. But you're going to need a new one: the euro just became a lot more credible than the pound as a currency for Scotland.
There does remain the question of whether Scotland, which has no proven history of having any sort of independent economy, would come anywhere close to being an acfeptabke risk for the EU and eurozone to take on. I'm not claiming to have an answer one way or another there, but it seems a bit of a risk to just assume that.
http://www.theguardian.com/politics/live/2016/jun/25/brexit-...
http://www.bbc.co.uk/news/uk-politics-eu-referendum-36629331
https://www.theguardian.com/uk-news/2016/jun/25/sturgeon-see... We knew all along that Scotland was strongly pro-EU.
http://www.bbc.co.uk/news/uk-scotland-scotland-politics-3561...
And that the only reason a bunch of people in Scotland voted to stay in the UK was because of promises about staying in EU.