There are already countries that adopted tax on BTC, though its status varies a lot in different jurisdictions.
For example, in the US and Australia btc is treated as an asset, while in the EU and Japan bitcoin was officially recognized as a means of payment.
Different approaches to cryptocurrencies define different types of taxes, but the overall fact is that privacy and full control over your funds are no longer the advantages of crypto.
Despite all these attempts of regulation, I think crypto community is still expanding and we will see more and more people using crypto for their daily needs in the nearest several years.