It is interesting. Debt is a given. It will typically always get bigger. The question becomes, at what point do the lenders get nervous about not getting their money back? This is the situation that China is in and why we will probably not see an alternative to the USD as global traded currency for some time.
I'm not sure that we will see a global financial meltdown because any debt blow-out will be controlled through various measures i.e. creditors taking a haircut, more quantitative easing, more printing of money etc. However, one cannot escape the fact that the financial system is engineered 80% of the time to rise whereas nature is much more a natural cycle of birth, growth, then death, coming back to square one again. Our financial system, together with inflation, will never accept this. It is engineered that the rich (the informed and those with access to the markets) will get richer and the poor will get poorer. We do need an alternative and I don't see cryptocurrencies (the block chain etc.) being the answer. What we need is for people to understand sustainability in nature and in the way they live their lives first. Then we can start fixing the financial system.