Not so much an optimist but I think the majority of the US undisclosed debt is out now, the stigma for large companies to admit they messed up has gone with the largest financial institutions all caving. It started with the write downs but they were obvisouly the tip of the iceberg.
Yes there are problems with both of our countries like the majority of our economy being built around the actions of a tiny percentage of greedy individuals rather than good old manufacturing but at the end of the day, America can revert to a self supporting economy, you have oil, you have sufficient food production and I'd imagine you have the resources to manufacture whatever is needed for sustaining the population.
I doubt times will get that bad but it puts it into perspective that the UK could not even feed it's population any more which I think is alarming.
I'm no expert but trying to read what I can when I can and it looks to me like the instability of an unknown political future can be as big an economic problem as real problems such as oil prices etc.