No real damage (except to those holding it) unless enough people have bought crypto with borrowed money. That's where it can cause damage to the overall economy.
The Wealth Effect is a real consideration here. During 2007 people cut their spending considerable because their houses went down in value, even if they were not, at that time, trying to sell their home. You would see the wealth effect work similarly if cypto assets were devalued.
As an example, I have 5-20k in crypto assets on any given day. My wife and I are also shopping for a new couch. If my crypto assets evaporated we would not be shopping for a new couch, nor would we be going out for dinner tonight, despite the fact that I am not spending down crypto assets to fund either of those purchases. The psychology behind it is that people adjust to a certain amount of "savings" and will adjust purchasing to get back to that level if their savings changes quickly and substantially.
60% of Americans (roughly) own real estate. It’s by far their largest asset. What proportion of Americans own crypto and how much of their net worth does it comprise? That would show you how significant the wealth effect would be.
As an example, I have 5-20k in crypto assets on any given day. My wife and I are also shopping for a new couch. If my crypto assets evaporated we would not be shopping for a new couch, nor would we be going out for dinner tonight, despite the fact that I am not spending down crypto assets to fund either of those purchases. The psychology behind it is that people adjust to a certain amount of "savings" and will adjust purchasing to get back to that level if their savings changes quickly and substantially.
https://en.wikipedia.org/wiki/Wealth_effect