Undoubtedly governments will continue to try to regulate crypto. Will they be able to fully succeed, that is the question. In principle, people don't need their permission or approval to use crypto, and nothing prevents them from using it explicitly.
I don't think governments will succeed because of the decentralized and censorship-resistant nature of crypto/Blockchain tech. Regulations can only be enforced on centralized exchanges and centralized wallet providers. Anything that's not centralized would be out of a single government's jurisdiction. As Bitcoin and other cryptocurrencies become more popular, governments will implement stricter regulations in order to minimize its growth worldwide. What ultimately matters is decentralization. As long as Bitcoin is able to stay that way, it will last a lifetime.
And here I disagree with you. Fiat forms of money are already being rapidly superseded by the digital version as more and more people pay with plastic cards and mobile apps. The proportion of people still paying with cash has been decreasing every year and will continue to decrease. And since fiat is practically impossible to control (just try to track the movement between people) and is 100% anonymous (there is no binding of banknotes to a specific person), then with the departure of fiat, society's finances will turn out to be more controllable and traceable.
Digital Fiat will mark the end of an era for privacy. After all, governments will have more control over people's finances. Fortunately, Bitcoin and other cryptocurrencies will be there to save the day. With decentralization at the forefront of crypto, I don't think privacy will fade away into oblivion anytime soon. Just my thoughts
