Separation is probably unwise econom,ically, but it's hardly idiotic. Canada stayed out of the USA despite plenty of chances to join in; this meant Canadians tended to be poorer than Americans but it's a price Canadians accepted. The logic in choosing to be a separate country even if that means economic trouble should be understandable enough and I'd hardly dismiss 40% or more of Scots as idiots for feeling this way.
(Yes, and it all becomes possible.... has a lot more appeal than the No-mongering politics of fear....)