I half-agree with this, in that the entire debate seems to have been framed in terms of economics - which is why the Yes to Independence campaign has tried to ignore it and appeal to the heart instead of the head. If it's about economics, no sane Scot would vote to secede.
However, there is a stronger, more visceral argument that actually, the United Kingdom, for 300 years now, has actually, on balance, been a force for good in the world and it is listened to more than any of the separate parts would. We believe in liberal values, freedom, tolerance etc etc. And Scotland makes the United Kingdom stronger than we would be without them.
In some senses, as an Englishman who is currently doing poorly in purely utilitarian terms out of the current arrangement (see my previous post), I should be happy if the Scots vote to secede. But I wouldn't be. I like the Union and think it has served all Brits well.
If Scotland votes itself independent, I shall wish my friends north of the border well, but I think they're going to find independence a tough haul, with no currency, no central bank, no Armed Forces, it's share of the UK's National Debt, no Diplomatic Service, no tax policy etc etc.