Scotland leaving Great Britain (and possibly the EU)?!?

As many of you probably don't know the Scottish Nationalist Party now has a majority in the Scottish Gov't. One of their biggest platforms is a call for Scottish independence. In the short term this might seem like a good idea. Scotland does have the North Sea Oil, after all. Problem is, that's only going to last for about another 10 years. Where does Scotland get their money after that? And if they pull out of GB does that mean they lose EU member status as well (which would be tragic and detrimental to their economy).
I know that Scotland has wanted to be free of the English yoke since Edward I, but come on! I feel like they're only going to hurt themselves here.
Check out part of the SNP's manifesto and tell me what you think about them pulling out of GB.

I agree with a lot of what it says (like pulling out of Iraq), but doesn't some of it sound a little ambitious (cus yeah, they'll be like Norway in no time!)

passionate about independence and equality for our nation.
The 300-year old Union is no longer fit for purpose. It was never designed for the 21st century world. It is well past its sell by date and is holding Scotland back.
The SNP believe Scotland and England should be equal nations – friends and partners - both free to make our own choices.
Scotland can be more successful. Looking around at home and at our near neighbours abroad, more and more Scots believe this too. Independence is the natural state for nations like our own.
Success for Scotland
Scotland has the people, the talent and potential to become one of the big success stories of the 21st century. We can match the success of independent Norway – according to the UN the best place in the world to live. We can do as well as independent Ireland, now the fourth most prosperous nation on the planet.
With independence Scotland will be free to flourish and grow. We can give our nation a competitive edge.
Peace and Prosperity
Together we can build a more prosperous nation, a Scotland that is a force for good, a voice for peace in our world.
Free to bring Scottish troops home from Iraq.
Free to remove nuclear weapons from Scotland’s shores.
Free to invest our oil wealth in a fund for future generations.
Peace and prosperity - equality and opportunity.
These are some of the best reasons for independence and why the SNP trust the people of Scotland to decide on independence in a referendum.