I think you'll be amazed at the extent to which BTC will be able to be controlled by strong central governments. I'd be shocked if in ten years there's not granular control over which wallets contain "tainted" bitcoin and cannot be converted to fiat except through actual money laundering. There's been a lot of consolidation of the exchanges in USA, tons of KYC controls in place now, and old-school options like localbitcoins.com or craigslist have disappeared or been nerfed beyond recognizability.
If people no longer "need" to convert BTC to fiat, this would no longer be a point of a control, but until then, governments can already and will continue to grow how much they can control BTC flow.
What about the lightning network? Or Liquid sidechain? There are lots of people working on scaling bitcoin so that it can be used like cash (low fees and anonymous).
When a user receives a payment in Cash App or Strike over the lightning network there is no way to track where that bitcoin came from. I haven't really tested that out yet, but I find the idea that bitcoin can be the rails of transferring value pretty compelling. Most people can still transact in fiat but with trustless interoperability between banks and service providers. And of course if people are happy transacting in units of bitcoin it can all be done in a trust-minimized way (with tradeoffs available for convenience, etc...).
But to your point, the government could crack down on the app stores and service providers to not support this kinda stuff.
> The question is more like: Are OK with government control?
I simply doubt that my opinion, or even that of the majority of the public, would change the outcome of what the government decides to do. They seem to be on a pro-KYC/AML/FINRA/IRS path regardless of public opinion.
If people no longer "need" to convert BTC to fiat, this would no longer be a point of a control, but until then, governments can already and will continue to grow how much they can control BTC flow.
Some of it is currently very ham-fisted, but there's a clear intent to devalue off-exchange wallets: https://www.coincenter.org/new-crypto-tax-reporting-obligati...