I have a hard time imagining what actual tangible disasters will happen if crypto currencies lose their value overnight besides some speculators losing money and some mining centers closing.
From 2007 to 2008, for example, global wealth declined about ~10% [1].
There's not much room left for central banks before we officially enter banana town. If cyrpto implodes, it could easily be worse than the financial crisis - which means, regulators have an interest in it NOT imploding.
[1] https://www.credit-suisse.com/about-us/en/reports-research/g...
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://www.barrons.com/articles/a-new-crypto-etf-is-here-yo...
At this point, I can't imagine financial regulators doing anything to stop it.