A lot of "yes" campaigners seem to have been sold on the idea that any warning of economic doom upon a "yes" vote is scaremongering, bullying, or "undermining the Scottish democratic process." Bullshit. Many intelligent people looking at this from a rational perspective have concluded that the "sweet spot" for Scotland is staying in the union and having devo-max; basically getting it both ways, with lots of self-government combined with a net financial income from the rest of the UK, as well as obviously ease of trade.
However, the pro-independence SNP are 100% blinkered on independence, at any cost. They will therefore paint warnings like this as lies designed purely to scupper their frankly loony picture of a prosperous independent Scotland, and a lot of Scots buy into it. Shame, really.
Americans might look on with bemusement; I can understand that. I guess it's a bit like Florida choosing to break away from the US, having a pro-Florida political party endlessly demonizing "them" (the rest of the US) as causing pretty much every economic and political woe Florida has going for it. As an English guy, I think this whole situation really sucks. If the UK breaks up, the whole of Britain will be worse off for it, but I suspect Scotland will take the bigger brunt of the pain. And given that it will have made the decision, it will deserve to.