As someone who moved to Scotland recently, the whole debate has been very interesting to me - but mostly because so many things I thought about Scotland have been proved to be nonsense.
Edinburgh is the second largest financial centre in the UK. The country makes far more money from its financial centre than it does from oil, but this fact is not widely known. It also is the second largest growing city in the UK creating the most new jobs outside London - mostly in IT, Business services and the energy industry.
The idea of a currency union with the UK is a political idea and is possibly being heavily debated to make it seem like a compromise when they finally decide that they will go for their own currency, a Scottish pound, with parity but no union with the UK pound. This is the deal the UK has with its other dependencies such as the Isle of Man. Again, this is not widely known, but the details are here -
http://en.wikipedia.org/wiki/Manx_poundWhile it would be a nice idea to see Scotland take on Bitcoin - or preferably Nxtcoin due to its green credentials - the GDP of £250Bn is far more than Bitcoin could handle!
Besides, its difficult enough to create a new currency and add it to a working economy - doing it with a crypto currency that hasn't been tested at that scale would be political suicide! ;-)
However, if we were talking about it happening in 20 years time, with plenty of practical experience of crypto, then I would guess the main advantage would be quick and easy international trade - and that would do wonders for that GDP! ;-)