Neverendum is not a route the SNP should follow. It smacks of the undemocratic machinations of the euro establishment, who keep going till they get the right answer - eventually landing in a window of external circumstances and dejectedness from opponents where they prevail; at which point no more referendums to sample whether moods have changed again.
I hope to see another bit at the cherry but it needs to have sounded triggering circumstances - such as UK voting to leave the EU. Barring such circumstances there should be a respectable interval before we go round it all again. I'm sorry to say that I think ten years is a respectable interval. The flip side is, btw, that a premature round two may not lead to further neverendums but the collapse of the whole cause - and the SNP.
I wouldn't be banking on the majority quoted above - I'd be wanting nearer to 60/40 before going again - the lesson of polls vs votes cast / 'shy bis' should not be forgotten too easily.
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The SNP should also await the results of corbyn labour - if he destroys labour as an electoral force, yes will be strengthened immeasurably.