Until there is a CBDC -> then its a case of BTC/etc for goods and services... price would be sedated...
They will allow ETF's as that will control the price by forcing people into paper bitcoin (etc) and closing down fiat on-off ramps and making un-hosted wallets illegal.
Transactions themselves are not difficult to track.
You can see the IP's behind, and also the Wallets interacting (infura etc) which provides a︃ list of all other wallet addresses in the associated wallet...
Now you can argue VPN...︄ however then there's otherways to determine the devices connecting and track via that nexos.
In addition in the future there is a push for digital ID which leads to "approved︅ digital access" to the internet (where all data is tracked against a ID) - darks︆ come in handy then i guess...
Let's say you are using a H/W - such︇ as Ledger, and utilise Ledger Live, Ledger knows all addresses, and all tokens/currencies in that︈ wallet and the device information and IP.
So even H/W are not safe...