Given that Scotland is one of Great Britain's poorer areas I don't see why those living in the north would want to risk their economic future by de coupling from the south.
Unless they significantly reduce local taxation there is little incentive for business to relocate north - and the outlying Highlands and Islands are relatively impoverished.
Whatever Salmon may postulate - he lives in a democracy and I reckon the Scots will put their pennies before their politics. If they don't then give it five years and there will be financial crisis.
As regards thoughts of military independence then that is just awful. what on earth would be achieved stoking a civil war?