The reason the banking system is showing signs of distress is because global claims on resources are way out of line with our underlying physical realities. Money and debt are not intrinsically valuable, they are just symbolic claims on physical resources. These symbolic claims on physical resources have grown exponentially over the last several decades (see charts for global debt). However, the underlying physical reality has not changed (and in some cases, has decreased -- i.e. fossil fuels being consumed).
As humans, we've come up with very creative ways to kick the can down the road; QE, low interest rates, shale drilling, etc. However, at a certain point, we will have to contend with the fact that infinite economic growth is unsustainable on a finite planet. We may not face this reality until massive debt defaults occur, or governments print huge quantities of cash to prevent this from happening (and hyperinflation ensues).
The modern economy is built off of fossil fuels. As fossil fuels grow increasingly scarce, it will become more expensive to produce and transport all of the physical products that people demand. This results in supply-side inflation, which partially explains some of the inflation we see today (the other side of inflation has been demand generated from central bank policies/government printing). At a certain point, fossil fuels will grow too difficult to extract and this will result in either: 1) debt defaults, economic depression, and oil/gas prices falling too low to justify extraction, or 2) massive currency printing by government resulting in hyperinflation.
We are simply a clever species that figured out how to temporarily blow past the environment's carrying capacity using stored solar energy. However, we ignored the fact that it was finite. We treated the resource as a flow instead of a stock, and that is why we are in for a rude awakening.