Edit:
The Big Short’s Michael Burry Explains Why Index Funds Are Like Subprime CDOs (2019)
https://archive.is/7mOuF
You can find structural problems that should inevitably arise and create a dynamic where say a short seller will make a killing.
However it can take years, sometimes over a decade, for things to bubble up.
The collapse of 2008 was decades in the making for instance