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I'm not sure I'm buyin into the ban concern.
It's a concern, for sure, just really hard to see it implemented.
Look at piracy, torrenting, usenet, etc. So long as people can make encrypted connections, crypto will continue.
I think that governments can, at best, disrupt things. But given governments are a smaller body count than users, my money is on those dedicated users staying one step ahead of the hammer.
Do you mean cryptography in general or cryptocurrencies in particular? Because cryptocurrencies ultimately do need an interface with other currencies, or some economy, where you can pay with them. If you cannot buy any real product or service with it, it has no value. Lets take Darknet market drug dealers for instance. They are not selling drugs because they like bitcoins and buy other drugs for themselves with it. They are selling drugs and exchanging the bitcoin into some fiat currency, so they can buy normal stuff with it.