To me it does not seem in Scotland's interest to create an unnecessary border between itself and it's biggest trade partner by far (England) with independent currencies, regulations and bureaucracy.
I also wonder how much it will costs to completely divide a highly integrated country which has existed for 300 years. As well as the costs to Scotland to set up and run all those new embassies, new DVLAs, etc etc.
By my calculations the increase in GDP by keeping it's own oil would be in the region of £1000 a year per head. Certainly not something one would turn down but not something that is going to turn Scotland into the Socialist Eutopia of Norway either.... And that oil isn't going to last forever.
All seems very simplistic and short sighted, which is the exact reason i'm terrified people will actually vote for it.