As long as humans exist, so will human nature. As long as human nature exists, so will greed and fear. As long as greed and fear exist, so will cycles.
I don’t believe in fixed duration cycles though (eg. 4 years) but I do believe in their inevitability.
Eg. Equity cycles tend to run between 7-20 years, debt cycles tend to run between 10-75 years, etc.
They don’t come with a pre-determined timeline. It’s a function of how much greed, fear, progress and inorganic manipulation these assets experience.