The situation has changed a lot and the reason why is brexit.
In 2014 the Scottish referendum a central part of the "No to independence" marketing was the idea that Scotland would be out of the EU and would be unlikely (or uncertain) if they would be able to return to the EU.
The victory margin for remaining in the UK was quite narrow and interviews from that time indicate that it was a large problem for many.
In 2016 in the Brexit referendum Scotland's regions voted unanimously to remain in the EU, but of course they were outnumbered by the English and Welsh.
So, since a central promise that inspired many to check the "No" to independence box to Scottish independence had changed: the conversation has come about again.
EDIT: I'm currently going through old youtube videos trying to find interesting "on the street" conversations and it's absolutely shocking how close the argument for Independence and Brexit are. I am not sure it's consistent to be pro-brexit and anti-scotland independence.