You raise allot of issues and each can be a whole discussion in itself
There are always problematic issues and this Obama economy is definitely terrible. That doesn't mean it is going to implode. The financial crisis of 2008 happened because Banks lent money to people who had no business getting a loan and who would have never been able to repay it out of their income.
From what I can tell the ballance of UK banks is much stronger, and leverage is lower then what it was before and during the financial crisis. Even in this bad economy if the bank are disciplined they won't lend to customers who are too risky (in other words they don't repeat the mistakes that led to the subprime crisis) then they will not implode.
The US national debt is a looming disaster albeit not an immediate one. If interest rates were much higher, say 6% the US would struggle to repay it's debt just like Spain did a couple of years ago on a similar (actually lower I believe) debt to gdp ratio. But unlike Spain the US can print as many dollars as it wants. If interest rates were higher they would print yet more dollars and diflate the currency's purchasing power (creating a massive price inflation) in order to be able to repay their debt. An outright default is pretty much impossible.
The commodity crash is a good thing, unless you are an oild sheikdom or a US shale player then tough luck.
Sorry I can't right now give you a very comprehensive answer, or rather opinion, becuae in the end you might be in the right and the economy will implode...
Do they, in the uk everyones balance shes seems to be on credit cars. Hardly anyone ownes a car here in the uk, all on finance. Banks have done zero cuts since 2008.
The us is 19 trillion in debt, not just oil, all commodity prices are down which suggests no ones got any money. Most people are in debt, and with student loans being another hidden debt.
Also the biggun for me wages have stagnated, the young cannot afford property, and we have been on emergency rates since 2009.