why would you think "the world economy is over" though? people said the same thing after the 1997 asian financial crisis, which similarly prompted fears of worldwide economic meltdown due to globalization/economic contagion. after that, 2007/2008 was supposed to be the great economic collapse that gold bugs have predicted for decades. but it wasn't. in both cases, the crises were driven by unsustainable debt. in both cases, the contagion was contained and confidence eventually returned to the markets.
i don't think the world economy as such is sustainable. but i learned many years ago to stop predicting collapse all the time. it's a waste of time and energy and you're usually wrong. just hedge your assets and keep stacking bitcoins. it'll pay off eventually.