Arrogance ? Yes, I suppose so - how arrogant to think that they can do at least as well, perhaps even better, than a clapped out ex-power huffing and puffing in distant corners of the world while manifestly falling behind much smaller nations in ways that really matter (infant mortality, life expectancy, health care, equality, poverty, women's participation, employment, etc., etc.). Having tried very hard indeed at the time to economically annihilate a minnow like Iceland, Brown and Darling are still trying to hold up the UK as some sort of preferable model - Iceland had 3.3% unemployment in July and has and is generally doing far better than the UK on all the above measures.
How dare the Yes camp suggest things could be better ? Go instead for The Emperor's New Clothes......no, make that Old Clothes.... and vote firmly NO. In reality, even the No camp know there is really no prospect of change within the UK, just continuance of the same hopeless mire - but at least there is certainty in that, to them comfortable certainty that soothes the endemic fear of change. They want to make little of comparisons with Austria, Denmark, Finland, Iceland, Luxembourg, Netherlands, Norway, Sweden, Switzerland, only four of which don't have their own currency. Slovakia democratically separated from the Czech republic a mere twenty years ago or so. There is no interest within today's Slovakia for reunion - and, notably, relations between the two are good, there was never any vindictiveness of the sort the (magnanimous ?) No camp has been threatening from the outset. A Yes outcome would be very interesting if only to see whether the UK will then behave as atrociously (surely not worse ?) toward Scotland as they did toward Iceland.