I completely disagree with you, I believe that other Scotland, if managed properly, would easily be able to prosper outwith the union. Oil is not the only commodity in Scotland, and an economic policy to highlight this and exploit Scotland's riches of other resources and skills.
Is economics the only consideration you make in this your decision on this? Do you, for example, consider Scotland being dragged out the EU against the stated will of the people of Scotland in making your decision?