Their whole thing was that Scottish independence was a good thing, but it wouldn't be possible (or even a good idea) because Scotland wouldn't be able to support their economy on their own. Does that response hold water?
As a disclaimer we are U.S. citizens, and I definitely don't know much about Scotland, so feel free to dump whatever information on me that you want
It's a pretty major oil producer for a European country, isn't it?
From what I could find it is about 5% of the Scottish GDP. Compare this to 8% for the USA, 10% for Canada and 18% for Norway. Not a whole lot to base an economy on.