The value of crypto can plummet with the world going into nuclear wasteland territory. There is no underlying value to crypto, and without some sort of central authority to prop it up, it can easily crash to zero or at least continue to have such wilds swings in value that it becomes a major obstacle to use as a currency. It is wildly popular as a fad now and prices reflect this, but at some point the fad is going to die down and the price is going to drop again. If the best point you can argue in it's favor is it makes international transactions slightly easier by avoiding exchange rates, what you have is a slightly easier to transport form of baseball cards.
Slightly easier? You can walk across a border with a billion dollars in crypto as easily as one dollar. The same goes for transaction costs.
And that billion in crypto can be worth three billion, or zero, by the time you cross the border. It has no intrinsic value, like a digital beanie baby. It is solely worth it's value as a fad.
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