As far as I can tell, there's no reason to believe fiat currencies/economies are headed for any kind of collapse.
Sure there is: the simple mathematical fact that an ever-increasing expansion of debt (which the current system is based on) is unsustainable.
It has to end, either voluntarily or involuntarily. And since TPTB don't seem too keen on letting the system end voluntarily....
Yes, but things usually drag out for years. The U.S. has had an unsustainable economic policy for decades, but still no revolution. The media is still supporting the current system. Critics have been proven right, but still nobody listens.