When it comes to complex systems and unintended consequences, the key phrase is "be careful what you wish for."
A lot of people are remarkably certain that their understanding of how systems will respond in the future is correct. Alan Greenspan was certain there was no housing bubble in 2007, for example (or he did a great job acting certain). There is no shortage of people who are certain the U.S. dollar is doomed to collapse, but only after losing the reserve currency status.
Other people are certain China can launch a gold-backed currency that will replace the dollar as the world's reserve currency.
Some are certain the U.S. stock market is going to crash this year, while others are equally certain that stocks will continue lofting higher on central bank tailwinds.
Being wrong about the way systems responded in the past doesn't seem to deter people from being certain about the future. Those who were certain there was no bubble in 2007-8 were wrong ...