How are you measuring wealth? Global debt is nearly 4 times global GDP
Debt / GDP ~= 4 years. That doesn't sound insane, particularly if much of that debt is secured, but I'm not any sort of financial analyst.
Of course the other issue is that my personal "gdp" runs out when I retire - thus I have to pay capital as well as interest to continue to own the asset afterwards. That doesn't apply to countries.