Exactly, but the value proposition of crypto is that it's *very* difficult to disrupt. See Nigeria for a current example of a national government trying and failing to get its population to give up on crypto.
It's only difficult to disrupt if the people involved stay entirely in the crypto ecosystem. The moment they want to interact with the real world, they open themselves up to the hard power of the state. The US govenrment has been very successful in disrupting crypto offramps; they don't need to break crypto math when they can just put the squeeze on people wanting to trade it for something else.
It's even easier to disrupt than dollars, at least exchanging dollars as cash is popular whereas cryptocurrencies rely predominantly on exchanges and bank transfers.