There's a possibility that Crypto Market would drop into zero anytime if someone could break blockchain networks and cripple it down and everything on the blockchain will no longer work like it used to be.
After that event, people wouldn't trust blockchain capabilities and it's purpose.
Therefore there would be massive droppings and people will turn their back on investing Cryptocurrencies and instead invest their money elsewhere.
If only there's groups of hackers that could penetrate more than 50% multiple blockchain servers all at the same time then that would be the worst disaster of Blockchain technology.
Nobody wants to put money on destructible networks.